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 A224383 #9 Apr 16 2013 14:18:38 %S A224383 11,19,59,67,131,227,251,499,1019,1987,4091,4099,8179,32707,32771, %T A224383 57347,65027,65539,114691,130051,131011,131059,262139,262147,507907, %U A224383 1040387,1048571,2097091,4161539,8372227,8388547,14680067,16744451,33538051,33554371,67108739,67108859,133955587 %N A224383 Primes of the form (2^n - 1)*(2^(m+2)) + 3 where n >= 1, m >= 1. %C A224383 These are the primes arising in A224380. %Y A224383 Cf. A224380. %K A224383 nonn %O A224383 1,1 %A A224383 _Brad Clardy_, Apr 05 2013