202 Is this number a prime? 2015-09-11T14:06:29.040
73 Calculate Phi (not Pi) 2015-11-12T23:56:22.273
69 Output the PPCG Prime 2017-10-22T20:44:46.313
66 Calculate the number of primes up to n 2016-02-26T19:08:02.277
60 Find the Smoothest Number 2014-08-18T23:30:24.447
56 List of primes under a million 2012-05-26T07:24:50.913
51 Coprimes up to N 2016-12-26T18:00:02.387
50 The prime ant 2017-10-09T02:28:45.480
44 The prime frog 2017-10-19T07:47:28.180
44 Prime parity peregrination 2019-06-24T09:49:01.093
42 A naturally occurring prime generator 2015-08-25T06:31:23.077
41 Determine whether a number is 2017-friable without primes in your source code 2017-01-01T00:00:19.757
39 Print the nth prime that contains n 2016-05-22T18:10:26.707
39 579085261 is CRAZY, 725582 is GOLF, 10757494 is ...? 2017-04-27T16:57:06.150
38 Output the Trinity Hall Prime 2017-09-07T23:58:39.207
37 Find the largest prime whose length, sum and product is prime 2014-07-31T03:43:40.670
37 Prime Up your code 2017-08-23T22:49:49.163
36 Compute the Carmichael function 2016-09-18T18:07:49.620
36 Primes other than Optimus 2017-08-02T14:28:51.013
35 Is it a Mersenne Prime? 2016-12-25T14:18:05.567
35 Plus Primes vs Minus Primes 2017-08-29T12:35:57.180
34 Fond Memories of Past Primes 2015-08-28T04:06:07.197
34 Generate n-ary numbers 2016-12-11T01:47:00.210
33 Finding The nth Prime such that the prime - 1 is divisible by n 2016-11-17T03:07:25.513
33 Smallest Prime with a Twist (A068103) 2017-01-04T18:49:32.650
33 No co-prime neighbors 2017-08-13T12:39:20.897
33 Encode an integer 2017-08-14T18:19:50.180
33 Return the Closest Prime Number 2019-03-27T15:16:02.610
32 Array Escape - get out of there 2016-07-25T11:08:57.993
32 Different ways of defining primes 2017-11-24T20:24:47.800
32 1, 2, 3, 14... or is it 15? 2018-03-30T22:11:53.260
30 That's a prime... almost 2016-02-22T17:36:42.077
30 Find Primes in Pi 2017-08-24T23:43:25.827
30 Primality testing formula 2018-08-10T02:16:15.617
29 Stuffing primes in a box 2016-03-07T10:17:38.023
29 Is it a Sphenic Number? 2017-07-23T15:13:59.473
29 Longest Prime Sums 2019-12-11T23:04:49.113
28 Fastest semiprime factorization 2012-10-07T05:16:00.663
28 Find the largest gap between good primes 2015-12-06T19:15:45.287
28 Prime counting function 2016-09-23T19:49:27.680
28 Prime Divisor Table 2017-02-08T21:05:56.273
28 Is it a turtle prime? 2017-07-17T16:53:17.877
27 Sum of primes between given range 2011-01-28T08:31:33.547
27 List of first n prime numbers most efficiently and in shortest code 2012-06-10T17:03:05.690
27 Recover the mutated source code 2014-12-29T02:35:20.863
27 Can the number reach 1 by repeatedly subtracting the largest prime less than it? 2016-09-11T12:14:56.830
27 Primenary Strings 2016-11-06T12:01:02.580
27 Calculate the prime factors 2016-12-26T04:00:21.613
27 Is it a Chen prime? 2017-07-10T11:54:59.060
27 Infinitely many primes 2019-09-05T07:38:39.810
26 Concatenating Primes 2016-04-11T23:59:35.430
26 Smallest n-digit prime containing only these digits 2017-02-09T22:08:08.363
26 A083569: Smallest m not occurring earlier such that m+n is prime 2017-06-19T03:14:30.400
26 Is it a weak prime? 2017-07-08T16:33:32.613
26 Can a neural network recognize primes? 2019-04-11T16:43:00.077
25 Counting +1 primes 2015-11-07T01:02:15.487
25 Approximate Brun's Constant 2017-01-22T00:31:45.340
25 Prime containment numbers (speed edition) 2018-11-30T07:25:41.263
24 Sum pyramid of primes 2015-12-05T12:17:05.827
24 The Solitude of Prime Numbers 2016-09-27T15:30:56.617
24 Climb a step to a prime 2017-06-09T09:48:01.160
24 Magnanimous numbers 2017-06-27T15:15:29.650
24 Can even numbers become prime? 2017-08-03T14:58:44.887
24 Bertrand's Primes 2018-02-13T15:27:27.247
23 Find the prime factors 2011-04-06T20:01:14.137
23 is_gaussian_prime(z)? 2014-08-07T15:54:54.570
23 Find the nth Fibohexaprime 2015-12-12T13:40:29.000
23 The Möbius Function 2016-01-24T13:54:37.050
23 Sort a number's divisors by prime factorization 2016-07-27T06:34:48.917
23 It's factors all the way down! 2016-12-27T15:45:30.803
23 Primes with prime bit-counts 2017-01-16T20:25:20.450
23 A prime test that's LITERALLY prime 2017-01-24T04:41:00.297
23 Fastest Home Prime Generator 2017-01-25T02:30:16.553
23 Find the Maximal Prime Powers 2017-02-06T18:31:40.207
23 Reuse your code! 2017-04-02T15:53:41.200
23 Do I have a prime twin? 2017-07-24T05:41:59.467
23 Prime Time Travel 2018-06-20T10:25:54.527
22 Factoring a 64-bit integer 2015-04-23T23:22:55.783
22 List Prime Numbers 2016-01-24T14:59:40.047
22 Prime Wednesdays 2016-07-28T02:57:26.907
22 Is it a super-prime? 2017-07-07T21:20:55.917
22 Get thee behind me Satan-Prime! 2017-08-25T16:44:44.643
22 Largest Prime Exponents 2017-10-21T17:43:20.337
22 Is this a consecutive-prime/constant-exponent number? 2018-05-16T15:36:56.327
21 Combinatorial products of unique primes 2014-09-21T20:01:40.183
21 Find the largest fragile prime 2014-11-19T16:28:11.047
21 Finding prime numbers without using "prime characters" 2015-02-20T16:08:52.993
21 Prime polynomials 2015-03-20T17:42:59.853
21 Triangular Ulam spiral 2016-01-15T11:15:06.947
21 Prime factors buddies 2016-09-20T07:42:09.577
21 Is my number Unique 2017-12-23T17:50:19.137
21 Finding Lonely Primes 2018-01-12T15:18:47.000
21 Prime containment numbers (golf edition) 2018-11-30T07:05:30.053
21 Some Prime Peerage 2019-09-12T13:14:30.813
20 Novel Prime Factors of Repunits 2015-12-14T16:17:32.123
20 Find the Emirps! 2016-11-09T20:07:25.117
20 Factor-poor numbers 2018-01-03T12:06:08.470
20 Cuban Primes 2019-05-14T13:10:26.127
19 Find largest prime which is still a prime after digit deletion 2013-02-21T14:27:06.763