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 A167464 #8 Sep 08 2022 08:45:48 %S A167464 5,7,13,19,31,37,43,47,53,59,61,67,73,79,83,89,97,103,107,109,113,127, %T A167464 131,137,139,151,157,163,173,179,181,191,193,197,199,211,223,227,229, %U A167464 241,257,271,277,283,307,311,313,331,337,349,359,367,373,379,383,389 %N A167464 Primes p such that 20*p+19 is composite. %H A167464 Vincenzo Librandi, <a href="/A167464/b167464.txt">Table of n, a(n) for n = 1..1000</a> %t A167464 Select[Prime[Range[500]], !PrimeQ[20 # + 19] &] %t A167464 (* _Vincenzo Librandi_, Feb 15 2014 *) %o A167464 (Magma) [p: p in PrimesUpTo(400) | not IsPrime(20*p+19)]; // _Vincenzo Librandi_, Feb 15 2014 %Y A167464 Cf. A157977. %K A167464 nonn,easy %O A167464 1,1 %A A167464 _Vincenzo Librandi_, Nov 04 2009