This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A163623 #13 Sep 08 2022 08:45:46 %S A163623 241,601,1201,1321,1801,2161,2281,2521,3001,3121,3361,4201,4441,4561, %T A163623 4801,5281,5521,5641,5881,6121,6361,6481,6841,6961,7321,7561,7681, %U A163623 8161,8521,8641,8761,9001,9241,9601,9721,10321,11161,12241,12601,12721,12841 %N A163623 Primes of the form 120*k + 1. %C A163623 a(n) = 120*A163624(n) + 1. %H A163623 G. C. Greubel, <a href="/A163623/b163623.txt">Table of n, a(n) for n = 1..5000</a> %t A163623 Select[120*Range[120]+1,PrimeQ] (* _Harvey P. Dale_, Dec 05 2013 *) %o A163623 (Magma) [a: n in [0..250]|IsPrime(a) where a is 120*n+1] // _Vincenzo Librandi_, Dec 13 2010 %o A163623 (PARI) lista(nn) = forprime(p=2, nn, if (!((p-1) % 120), print1(p, ", "))); \\ _Michel Marcus_, Jul 31 2017 %Y A163623 Cf. A163573, A163624. %K A163623 nonn %O A163623 1,1 %A A163623 _Zak Seidov_, Aug 01 2009