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 A120222 #18 Sep 27 2024 05:38:07 %S A120222 1,5,7,11,13,17,23,25,35,37,47,55,61,73,77,83,91,95,101,103,107,121, %T A120222 125,131,143,151,161,173,175,187,205,217,221,233,245,257,263,271,277, %U A120222 287,305,311,325,331,347,367,373,391,395,425,443,451,455,461,481,503,551 %N A120222 Numbers k such that 6+k and 6*k+1 are prime. %C A120222 All terms == 1 or 5 (mod 6). - _Robert Israel_, Oct 29 2020 %H A120222 Robert Israel, <a href="/A120222/b120222.txt">Table of n, a(n) for n = 1..10000</a> %p A120222 select(n -> isprime(n+6) and isprime(6*n+1), [seq(i,i=1..1000,2)]); # _Robert Israel_, Oct 29 2020 %t A120222 Select[Range[551],PrimeQ[#+6]&&PrimeQ[6#+1]&] (* _James C. McMahon_, Sep 26 2024 *) %Y A120222 Cf. A120226, A120227, A120228, A106057-A106066. %K A120222 nonn %O A120222 1,2 %A A120222 _Zak Seidov_, Jun 10 2006