342 Regex that only matches itself 2014-05-30T16:20:31.400
202 Is this number a prime? 2015-09-11T14:06:29.040
154 Is My Swipe Pattern Legal? 2018-02-12T08:54:27.190
145 "KNOT" or "NOT"? 2014-06-06T14:45:34.143
104 I'm a palindrome. Are you? 2017-02-20T01:34:20.470
94 Will it halt? (Cops) 2017-07-24T15:46:45.840
92 Would this string work as string? 2019-03-18T15:21:32.813
80 Detect MS Windows 2017-01-08T11:53:58.970
76 Count of "a"s and "b"s must be equal. Did you get it computer? 2016-07-20T19:12:01.463
75 Non-discriminating Programming 2018-03-01T14:02:57.473
73 Is this relationship creepy? 2017-05-24T18:14:40.520
72 Am I a Rude Number? 2019-02-27T03:21:25.830
68 Magic the Gathering: Friends or Foes? 2017-03-13T16:54:31.207
67 Is this even or odd? 2017-03-21T10:30:34.823
67 Is it a Cyclops number? "Nobody" knows! 2019-03-08T02:18:09.707
66 Regex Golf: Verify a Sudoku Solution 2016-04-21T21:37:27.557
65 Only Even Bytes 2016-08-04T22:54:49.263
64 Check if words are isomorphs 2015-05-19T20:45:09.843
64 Golf all the 16 logic gates with 2 inputs and 1 output! 2016-06-14T23:07:55.713
60 There are two new sheriffs in town – Identifying DJMcMego pairs! 2018-02-22T23:28:33.583
59 Write the shortest self-identifying program (a quine variant) 2013-04-17T14:29:36.033
58 Is my prison secure? 2017-06-14T12:41:41.823
58 Is the number binary-heavy? 2017-07-13T14:26:46.563
57 Are the brackets fully matched? 2016-04-05T05:12:44.890
54 Surrounded Countries 2016-01-11T06:51:01.677
54 Dennis numbers 2.0 2016-09-30T15:44:22.307
53 Test a number for narcissism 2013-11-14T01:55:37.983
53 Is my OS 32-bit or 64-bit? 2017-06-19T20:12:03.273
52 Is it a lipogram? 2016-02-22T19:20:33.327
52 Do n and n^3 have the same set of digits? 2016-11-14T19:02:08.850
52 Tasteless and other bugs 2016-12-04T16:08:37.073
51 Can my 4-note music box play that song? 2016-01-26T18:36:21.417
50 Code (Mini) Golf 2016-01-19T23:40:07.100
49 Your car only turns right! 2014-10-03T08:36:43.770
49 Check if computer is connected to the internet 2017-01-13T13:29:41.013
49 Am I a Fibonacci Number? 2017-06-14T16:58:11.277
48 Determine if a coin system is Canonical 2016-10-13T20:27:19.410
48 Is this Tic-Tac-Toe board valid? 2016-12-12T14:34:33.273
48 Does it Lead or Follow? 2018-03-19T20:09:13.077
48 Detect heat waves 2018-04-23T18:33:07.827
47 Is this a function? 2017-05-04T20:44:51.673
47 Is my triangle right? 2017-10-23T14:33:24.553
47 Is it double speak? 2019-08-06T15:31:47.907
46 Lever Simulator 2015 2015-11-24T22:02:16.217
46 Will it halt? (Robbers) 2017-07-24T15:48:37.750
44 Is this string a square? 2017-06-06T16:19:20.313
44 It's Hip to be Square 2017-06-08T11:20:23.180
43 Is it a pangram? 2015-12-10T02:25:53.257
43 Has My Pie Been Bisected? 2016-06-04T04:29:54.907
43 Simple Circular Words 2020-01-27T04:52:04.447
42 Shortest code to determine if a string is a palindrome 2013-04-08T18:29:49.763
42 Imposters at the Zoo 2016-01-27T14:44:45.303
42 No strings attached! 2017-01-13T17:06:56.880
41 Is it a leap year? 2015-05-26T10:36:04.493
41 Goodness Giza Golf! 2016-11-16T16:41:07.030
41 An Array of Challenges #1: Alternating Arrays 2016-12-18T17:51:06.027
41 Write a haiku-w detector 2017-01-29T10:12:05.660
41 Is this number an integer power of -2? 2017-04-06T12:02:00.010
40 Detect Failing Castles 2017-02-03T12:27:00.943
40 An abundance of integers! 2017-02-21T01:01:38.620
40 Am I divisible by double the sum of my digits? 2017-07-03T13:00:47.433
40 Am I an insignificant array? 2017-09-20T15:37:14.223
40 In Search of a Soulmate 2017-10-11T20:09:40.317
40 A well linked challenge 2019-02-03T00:18:11.387
40 Is it a circumfix? 2019-10-26T21:13:04.767
39 "Convenient palindrome" checker 2014-05-18T16:19:42.357
39 Is there a bump? 2018-02-14T22:31:11.793
38 Divisibility test 2016-07-21T16:11:20.220
38 Zero sum covers 2017-01-10T07:59:58.973
38 Is this number a factorial? 2017-05-20T09:19:35.893
38 Wait, what language is this? 2018-01-21T18:48:15.630
38 Is this number evil? 2018-08-01T15:08:21.957
37 Check whether letters of word are in alphabetical order 2015-03-01T11:42:37.923
37 Is it a Proth number? 2016-08-10T22:07:56.617
37 Folding Numbers 2016-10-06T12:53:03.507
37 Antsy permutations 2016-10-24T07:32:38.987
37 The strange ordering of Sharkovskii 2016-12-20T13:10:27.660
37 Will I make it out in time? 2017-08-08T12:30:12.240
37 Is the matrix centrosymmetric... and so is the code? 2018-07-16T20:24:37.490
36 Acronyms can really obviously narrow your message sensors 2015-10-19T16:58:11.417
36 Does the start equal the end? 2017-05-13T17:03:04.243
36 Java is to JavaScript as Car is to Carpet 2017-07-13T15:40:59.007
35 Infinite Labyrinths 2015-03-30T15:27:15.343
35 The Will Rogers Phenomenon 2015-07-27T16:52:16.507
35 Manage Trash So 2016-02-25T16:08:54.523
35 As Easy as One-Two-Three 2016-08-30T03:28:53.697
35 Is it a Mersenne Prime? 2016-12-25T14:18:05.567
35 Is this string a letter doing a cartwheel? 2017-08-02T17:08:13.923
34 Yahtzee Small Straight Detection 2016-03-07T17:45:19.230
34 A Numpad's Knight Numbers 2016-04-18T18:55:20.390
34 Easy-to-multiply numbers 2017-12-18T22:48:18.663
33 Is it a prefix code? 2016-05-02T01:23:30.527
33 Is this number Loeschian? 2016-08-04T15:34:41.337
33 Is this number triangular? 2017-05-22T20:26:19.473
33 Is this number a repdigit? 2017-06-08T02:50:36.133
33 No co-prime neighbors 2017-08-13T12:39:20.897
33 Is it a strong word? 2017-09-09T21:48:43.330
33 Is my barcode valid? 2017-11-15T15:19:41.803
33 Is my Matrix Arrowhead? 2017-12-20T19:00:16.643