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 A301918 #26 Jul 05 2020 08:42:27
%S A301918 2,3,5,7,17,19,29,31,37,41,43,53,61,67,73,79,89,97,101,103,113,127,
%T A301918 137,139,149,151,157,163,173,193,197,199,211,223,233,241,257,269,271,
%U A301918 281,283,293,307,317,331,337,349,353,367,373,379,389,397,401,409,439
%N A301918 Primes which divide numbers of the form 3^k+3.
%C A301918 Union of {3} and A301916, because 3^k + 3 = 3*(3^(k-1) + 1). [Comment edited by _Jeppe Stig Nielsen_, Jul 04 2020.]
%C A301918 Can be used to factor P+1 values where P is a potential prime of the form 3^k+2.
%C A301918 Is this 2 and 3 with A045318? - _David A. Corneth_, May 04 2018
%C A301918 No, it is not. Primes like 769, 1297, ... are also here but not in A045318. See A320481 for the explanation. - _Jeppe Stig Nielsen_, Jun 27 2020
%e A301918 All values of 3^k+3 are multiples of 2, so 2 is in the sequence.
%e A301918 3^4+3 = 84, which is a multiple of 7, so 7 is in the sequence.
%Y A301918 Cf. A045318, A301916, A301917, A301919.
%K A301918 nonn
%O A301918 1,1
%A A301918 _Luke W. Richards_, Mar 28 2018