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 A145490 #11 Mar 03 2019 21:47:00 %S A145490 -2,-1,3,8,9,13,15,20,23,29,34,35,48,55,59,63,69,73,78,84,93,100,104, %T A145490 115,119,134,135,139,148,150,169,174,178,185,189,199,203,210,213,218, %U A145490 238,254,255,260,265,268,275,280,288,289,293,294,295,308,309,335,344 %N A145490 Numbers k such that 6k+19 is prime and absolute value of 12k+1 is also prime. %H A145490 Nathaniel Johnston, <a href="/A145490/b145490.txt">Table of n, a(n) for n = 1..10000</a> %F A145490 a(n) = (A145480(n-2)-1)/12 for n >= 3. %p A145490 with(numtheory): a:=proc(n) if(isprime(6*n+19) and isprime(abs(12*n+1)))then return n: fi: return NULL: end: seq(a(n),n=-2..350); # _Nathaniel Johnston_, Jul 26 2011 %Y A145490 Cf. A063908-A063913, A092109, A145471-A145490. %K A145490 sign,easy %O A145490 1,1 %A A145490 _Artur Jasinski_, Oct 11 2008 %E A145490 Corrected by _Arkadiusz Wesolowski_, Jul 26 2011