Problem I
Happy Happy Prime Prime — Problem Statistics

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Submissions	7877
Accepted submissions	3269
Submission ratio	41.50%
Authors	2653
Accepted authors	2347
Author ratio	88.47%

#	User	Runtime	Language	Date
1	Jakub Jarząbek	0.03 s	C#	2020-10-15 23:21:17
2	Raja Sanjeev Kumar Nakka	0.05 s	C#	2016-06-23 16:42:27
3	Robert Low	0.05 s	C#	2016-07-30 15:09:51
4	Marek	0.05 s	C#	2016-09-21 20:20:19
5	Andrzej Krajniak	0.05 s	C#	2016-09-22 08:10:05
6	Stephen (Joe) Malone	0.05 s	C#	2018-02-24 20:32:05
7	Soujatya Sanyal	0.05 s	C#	2019-02-09 22:51:45
8	Samuel Leclerc	0.05 s	C#	2021-04-16 20:27:05
9	Khin Nyunt	0.06 s	C#	2016-12-11 15:43:39
10	Mirjam Skobe	0.06 s	C#	2016-12-11 18:39:19

#	User	Runtime	Language	Date
1	Ari Páll Agnarsson	0.07 s	Common Lisp	2021-03-21 04:44:54

#	User	Runtime	Language	Date
1	Jacob Harris Cryer Kragh	0.08 s	F#	2022-11-29 18:02:40

#	User	Runtime	Language	Date
1	Nischal Bhandari	0.02 s	Go	2025-05-16 22:40:33
2	Ola Dahl	0.08 s	Go	2022-11-06 16:14:56
3	Krzysztof Gibuła	0.11 s	Go	2021-05-11 23:59:36
4	Norbert Voelker	0.13 s	Go	2021-07-06 21:36:48
5	Matthew Sheldon	0.13 s	Go	2023-09-08 22:16:33
6	Julian Duniec	0.17 s	Go	2024-09-10 12:57:51
7	Christoffer Danborg Irvall	0.25 s	Go	2019-05-08 00:07:29
8	Matthew Chao	0.26 s	Go	2018-05-06 20:12:18

#	User	Runtime	Language	Date
1	Steinar Simonnes	0.01 s	Haskell	2024-06-25 11:13:03
2	Wilfried van Asten	0.02 s	Haskell	2015-12-20 11:35:32
3	Mattias Harrysson	0.04 s	Haskell	2015-11-18 18:49:26
4	Anthony Clark	0.05 s	Haskell	2017-03-04 05:09:32
5	Jared Beller	0.05 s	Haskell	2018-02-23 05:49:11
6	Maria De La Torre Romo	0.06 s	Haskell	2018-02-24 18:58:46
7	Jørn Lode	0.06 s	Haskell	2020-10-06 18:53:59
8	Hidden user	0.07 s	Haskell	2019-11-05 16:33:03
9	Gustaf Pihl	0.07 s	Haskell	2024-04-14 03:06:19
10	Hidden user	0.14 s	Haskell	2019-05-10 17:23:30

#	User	Runtime	Language	Date
1	Guangyi Zhou	0.07 s	Java	2024-12-12 13:07:27
2	Samuel Klingström	0.08 s	Java	2017-05-11 19:48:12
3	Sven Rönnbäck	0.08 s	Java	2022-03-27 17:17:14
4	Đức Phạm Hoài	0.09 s	Java	2018-10-12 17:43:01
5	Issa Issack	0.09 s	Java	2025-02-20 04:01:44
6	Winston Cheung	0.10 s	Java	2017-03-05 03:00:23
7	José Vander Meulen	0.10 s	Java	2018-04-30 20:50:12
8	Dat Vo Nguyen Tien	0.10 s	Java	2022-01-31 04:27:09
9	Đỗ Duy Tân	0.11 s	Java	2015-10-21 04:15:11
10	Tú Huỳnh	0.11 s	Java	2015-10-21 06:14:55

#	User	Runtime	Language	Date
1	Khin Nyunt	0.67 s	JavaScript (Node.js)	2021-11-15 16:29:09

#	User	Runtime	Language	Date
1	Jimmy Gustafsson	0.05 s	JavaScript (SpiderMonkey)	2024-08-03 00:37:07
2	Christian Cederquist	0.07 s	JavaScript (SpiderMonkey)	2023-02-15 10:34:37
3	Zach Tschetter	0.08 s	JavaScript (SpiderMonkey)	2023-05-03 17:27:00
4	Peter Kedemo	0.09 s	JavaScript (SpiderMonkey)	2016-06-11 21:30:16
5	Bjørn Chr. Soltvedt	0.35 s	JavaScript (SpiderMonkey)	2016-02-21 21:01:07
6	J M	0.35 s	JavaScript (SpiderMonkey)	2016-10-07 15:33:25
7	Caullen Sasnett	0.98 s	JavaScript (SpiderMonkey)	2018-02-24 19:01:39

#	User	Runtime	Language	Date
1	Timothy Gaede	0.76 s	Julia	2024-04-10 08:36:51
2	Danny Robinson	0.82 s	Julia	2023-09-11 17:04:04

#	User	Runtime	Language	Date
1	Sam Keyser	0.28 s	Kotlin	2023-04-17 03:05:40
2	Silas Lenz	0.34 s	Kotlin	2019-05-06 14:04:13
3	Hidden user	0.44 s	Kotlin	2017-11-29 00:50:11
4	Dayan Ruben Gonzalez	0.48 s	Kotlin	2020-10-02 06:29:25
5	Neil Harmon	0.56 s	Kotlin	2019-09-26 14:31:36
6	Adam Rankin	0.82 s	Kotlin	2023-05-05 21:58:47

#	User	Runtime	Language	Date
1	Hidden user	0.02 s	OCaml	2024-09-30 17:33:36

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2017-08-23 16:19:43

#	User	Runtime	Language	Date
1	Nguyen Phuoc Loc (FUG CT)	0.06 s	PHP	2023-12-23 22:19:22

#	User	Runtime	Language	Date
1	Rhys Balevicius	0.05 s	Python 2	2017-10-31 00:00:07
2	Andrei Stoica	0.06 s	Python 2	2017-10-25 18:34:49
3	Oskar Haarklou Veileborg	0.07 s	Python 2	2015-12-11 12:16:30
4	Denis Godunov	0.07 s	Python 2	2017-05-26 14:14:59
5	Sigurður Jens Albertsson	0.07 s	Python 2	2017-12-01 00:40:47
6	Hidden user	0.08 s	Python 2	2015-11-21 22:39:44
7	Asger Hautop Drewsen	0.08 s	Python 2	2016-01-27 15:16:17
8	Kjetil Børs-Lind	0.08 s	Python 2	2018-01-25 19:15:18
9	Bertrand Evertz	0.08 s	Python 2	2019-11-01 11:36:23
10	Lars Tveito	0.09 s	Python 2	2016-09-11 22:54:31

#	User	Runtime	Language	Date
1	Sam Westigard	0.03 s	Python 3	2018-04-02 07:33:59
2	Markus	0.03 s	Python 3	2019-06-27 21:32:42
3	Christian Lindeström	0.04 s	Python 3	2016-08-18 00:25:19
4	Arturas Aleksandrauskas	0.04 s	Python 3	2019-04-17 22:01:14
5	Wayne	0.05 s	Python 3	2016-01-25 12:48:08
6	Robin Andersson	0.05 s	Python 3	2016-05-01 11:38:36
7	Nicholas Lantz	0.05 s	Python 3	2016-10-22 03:54:40
8	Duke Nguyen	0.05 s	Python 3	2017-06-22 05:42:28
9	Hidden user	0.05 s	Python 3	2018-03-24 19:05:37
10	Fred Bloggs	0.05 s	Python 3	2019-03-16 07:30:16

#	User	Runtime	Language	Date
1	Hidden user	0.08 s	Ruby	2019-11-18 12:53:11
2	Hidden user	0.08 s	Ruby	2020-08-01 16:57:39
3	Thomas Feld	0.08 s	Ruby	2023-05-03 14:54:54
4	Clifford Owino	0.11 s	Ruby	2017-06-27 22:31:06
5	Robin Boregrim	0.13 s	Ruby	2018-04-26 19:19:57

#	User	Runtime	Language	Date
1	Davíð Helgason	0.00 s	Rust	2020-03-11 17:43:12
2	Kristinn Vikar	0.00 s	Rust	2023-10-17 17:53:42
3	Egor Kulikov	0.00 s	Rust	2025-01-08 14:25:57
4	Vincent Lagerros	0.00 s	Rust	2025-01-30 22:20:12
5	Aaron Lengyel	0.01 s	Rust	2023-04-29 01:54:51
6	Isak Jägberg	0.02 s	Rust	2019-05-05 17:54:35
7	David Rasch	0.02 s	Rust	2021-03-08 17:27:45
8	Bas Dirks	0.02 s	Rust	2022-01-15 00:33:14
9	Lily Gloudemans	0.02 s	Rust	2024-09-24 23:38:51
10	Alexander Berntsson	0.02 s	Rust	2025-04-19 22:59:16

#	User	Runtime	Language	Date
1	Robert Morelli	0.02 s	Swift	2024-10-28 05:18:58

#	User	Length	Language	Date
1	furtive	575	C	2020-09-29 16:44:08
2	Aljon Novelo	842	C	2024-05-10 13:53:37
3	Ryan O'Hara	914	C	2017-11-08 02:59:16
4	Adam Evans	926	C	2016-08-29 23:42:58
5	Felix Skjutar	956	C	2023-04-18 17:45:15
6	Sami Al Chalati	1071	C	2024-07-12 15:46:29
7	Duane Currie	1079	C	2020-02-02 14:50:47
8	Ling Wen Jian	1092	C	2019-01-10 17:53:38
9	Eric Dand	1093	C	2017-03-09 05:03:43
10	Kyle Fairfax	1137	C	2018-02-24 19:57:10

#	User	Length	Language	Date
1	traxex	881	C#	2024-05-07 11:51:26
2	Þorsteinn Þorvaldsson	1487	C#	2017-06-04 22:05:45
3	Robert Low	1517	C#	2016-07-30 15:09:51
4	florist swe	1548	C#	2024-12-05 01:34:36
5	Khin Nyunt	1557	C#	2016-12-11 15:43:39
6	Björn Pettersson	1591	C#	2018-10-15 23:51:11
7	Jerome Beaulieu	1592	C#	2021-04-16 20:54:24
8	Raphael Albiez	1638	C#	2018-10-10 08:45:20
9	Vincent Paradis	1732	C#	2021-04-16 20:07:56
10	Simon Grey	1805	C#	2018-10-12 22:31:47

#	User	Length	Language	Date
1	Yeung Man Tsung	495	C++	2022-11-20 10:53:13
2	Johan Wind	539	C++	2018-09-02 23:08:22
3	Zane Yu	573	C++	2019-01-03 09:01:04
4	Lawrence Li	591	C++	2018-03-24 00:48:55
5	Mustefa Kamil	610	C++	2019-05-02 21:31:32
6	Izzati Al Vandiar	632	C++	2016-03-02 17:27:50
7	Oisín O'Duibhir	642	C++	2018-10-05 14:23:05
8	Josenildo Silva	650	C++	2017-04-10 05:03:24
9	Công Hậu Trần	661	C++	2016-04-08 15:15:36
10	Sidhant Bansal	662	C++	2019-09-17 10:39:37

#	User	Length	Language	Date
1	Ari Páll Agnarsson	11443	Common Lisp	2021-03-21 04:44:54

#	User	Length	Language	Date
1	Jacob Harris Cryer Kragh	1458	F#	2022-11-29 17:59:13

#	User	Length	Language	Date
1	Julian Duniec	736	Go	2024-09-10 12:57:51
2	Nischal Bhandari	931	Go	2025-05-16 22:40:33
3	Krzysztof Gibuła	1024	Go	2021-05-11 23:59:36
4	Matthew Sheldon	1029	Go	2023-09-08 22:16:33
5	Norbert Voelker	1555	Go	2021-07-06 21:36:48
6	Matthew Chao	1829	Go	2018-05-06 20:12:18
7	Ola Dahl	1907	Go	2022-11-06 16:14:56
8	Christoffer Danborg Irvall	1943	Go	2019-05-08 00:07:29

#	User	Length	Language	Date
1	Gustaf Pihl	470	Haskell	2024-04-14 03:23:51
2	Brandon Tang	640	Haskell	2023-09-06 10:27:07
3	Anthony Clark	706	Haskell	2017-03-04 05:09:32
4	Hidden user	732	Haskell	2019-05-10 17:23:30
5	Jared Beller	765	Haskell	2018-02-23 05:49:11
6	Jørn Lode	989	Haskell	2020-10-06 18:53:59
7	César Antonio Carvajal de la Haza	1021	Haskell	2017-05-01 20:59:03
8	JD Hoglan	1158	Haskell	2016-05-04 23:10:22
9	Mattias Harrysson	1173	Haskell	2015-11-18 18:49:26
10	Maria De La Torre Romo	1304	Haskell	2018-02-24 18:58:46

#	User	Length	Language	Date
1	Amon Al-khatib	851	Java	2015-12-19 22:01:59
2	Benjamin Scott Pruett	871	Java	2015-10-17 19:26:07
3	Tobias Lehnert	899	Java	2018-05-03 18:39:10
4	Pedro Contipelli	908	Java	2016-04-26 00:50:29
5	Hidden user	925	Java	2022-11-10 12:02:53
6	Pramitha Jayasooriya	928	Java	2024-02-04 02:40:50
7	Duncan Page	932	Java	2017-09-12 00:10:11
8	Ada Clevinger	936	Java	2018-06-02 19:16:08
9	Marcus Phua	952	Java	2018-06-11 10:49:58
10	Weiyu Wang	961	Java	2017-10-01 20:04:58

#	User	Length	Language	Date
1	Khin Nyunt	2006	JavaScript (Node.js)	2021-11-15 16:29:09

#	User	Length	Language	Date
1	Jimmy Gustafsson	310	JavaScript (SpiderMonkey)	2024-08-03 00:37:07
2	Zach Tschetter	705	JavaScript (SpiderMonkey)	2023-05-03 17:27:00
3	Christian Cederquist	744	JavaScript (SpiderMonkey)	2023-02-15 10:34:37
4	Caullen Sasnett	1359	JavaScript (SpiderMonkey)	2018-02-24 19:01:39
5	Bjørn Chr. Soltvedt	6424	JavaScript (SpiderMonkey)	2016-02-21 21:01:07
6	J M	8282	JavaScript (SpiderMonkey)	2016-10-07 15:33:25
7	Peter Kedemo	8924	JavaScript (SpiderMonkey)	2016-06-11 21:30:16

#	User	Length	Language	Date
1	Danny Robinson	184	Julia	2023-09-11 17:04:04
2	Timothy Gaede	2207	Julia	2024-04-10 08:36:51

#	User	Length	Language	Date
1	Dayan Ruben Gonzalez	658	Kotlin	2020-10-02 06:29:25
2	Hidden user	810	Kotlin	2017-11-29 00:50:11
3	Adam Rankin	821	Kotlin	2023-05-05 21:58:47
4	Sam Keyser	1163	Kotlin	2023-04-17 03:05:40
5	Neil Harmon	2219	Kotlin	2019-09-26 14:31:36
6	Silas Lenz	3641	Kotlin	2019-05-06 14:04:13

#	User	Length	Language	Date
1	Hidden user	847	OCaml	2024-09-30 17:33:36

#	User	Length	Language	Date
1	Ingemar Ragnemalm	2257	Pascal	2017-08-23 16:19:43

#	User	Length	Language	Date
1	Nguyen Phuoc Loc (FUG CT)	1118	PHP	2023-12-23 22:19:22

#	User	Length	Language	Date
1	Thomas Feld	476	Python 2	2019-08-26 14:39:28
2	Kjetil Børs-Lind	519	Python 2	2018-01-25 19:15:18
3	Roman Bohuk	531	Python 2	2017-03-08 01:45:31
4	Conor McCauley	531	Python 2	2019-10-29 00:39:06
5	Eoin Davey	546	Python 2	2018-03-27 16:04:07
6	Måns Gezelius	556	Python 2	2018-04-24 01:00:11
7	Oskar Haarklou Veileborg	577	Python 2	2015-12-11 12:16:30
8	Lars Tveito	579	Python 2	2016-09-11 22:54:31
9	Zak Thompson	599	Python 2	2017-05-11 20:03:58
10	Johan Lyts	602	Python 2	2019-03-26 14:23:44

#	User	Length	Language	Date
1	Gustav Elmqvist	168	Python 3	2023-03-02 18:07:00
2	Jorke de Vlas	190	Python 3	2024-04-04 12:28:54
3	Erik Ulff	238	Python 3	2024-03-14 12:10:59
4	Charles Ancheta	283	Python 3	2023-04-18 22:22:47
5	Farzam Abrishami	288	Python 3	2024-01-26 00:08:33
6	Zach Woods	322	Python 3	2018-10-05 23:38:29
7	Karen Birgitta Hanssen	347	Python 3	2023-01-04 01:03:25
8	Tai Tze Kin	348	Python 3	2024-05-07 12:30:04
9	Ari Blondal	385	Python 3	2020-07-03 09:35:13
10	Thibault Raffaillac	407	Python 3	2024-07-29 13:29:55

#	User	Length	Language	Date
1	Thomas Feld	112	Ruby	2023-05-03 14:54:54
2	Hidden user	258	Ruby	2019-11-18 12:47:17
3	Hidden user	377	Ruby	2020-08-01 16:57:39
4	Robin Boregrim	469	Ruby	2018-04-26 19:19:57
5	Clifford Owino	523	Ruby	2017-06-27 22:31:06

#	User	Length	Language	Date
1	David Rasch	948	Rust	2021-03-08 17:27:45
2	Ming Kang	1221	Rust	2025-06-08 08:45:00
3	Lily Gloudemans	1792	Rust	2024-09-24 23:38:51
4	Vincent Lagerros	2020	Rust	2025-01-30 22:15:35
5	Martin Simensen	2021	Rust	2019-05-13 16:48:40
6	Kristinn Vikar	2242	Rust	2023-10-17 17:29:03
7	Alexander Berntsson	2316	Rust	2025-04-19 22:59:16
8	Isak Jägberg	2510	Rust	2019-05-05 17:55:02
9	Bas Dirks	2615	Rust	2022-01-15 00:33:14
10	Davíð Helgason	3130	Rust	2020-03-11 17:31:12

#	User	Length	Language	Date
1	Robert Morelli	1006	Swift	2024-10-28 05:18:58

Solution running time distribution