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 A174281 #9 Sep 08 2022 08:45:51 %S A174281 2,5,7,17,19,23,29,47,73,83,89,97,107,113,127,137,149,163,197,227,229, %T A174281 233,239,257,269,307,359,367,373,379,439,449,557,569,619,647,673,727, %U A174281 739,769,797,827,877,883,919,977,983,997,1009,1033,1039,1087,1117,1123 %N A174281 Primes p such that 20*p^2+32*p+13 is also prime. %H A174281 Vincenzo Librandi, <a href="/A174281/b174281.txt">Table of n, a(n) for n = 1..1000</a> %e A174281 For p=2, 20*2^2+32*2+13=157; p=5, 20*5^2+32*5+13=673. %t A174281 Select[Prime[Range[200]], PrimeQ[20 #^2 + 32 # + 13]&] (* _Vincenzo Librandi_, Apr 16 2013 *) %o A174281 (Magma) [p: p in PrimesUpTo(2000)| IsPrime(20*p^2+32*p+13)]; %Y A174281 Cf. A154414. %K A174281 nonn,easy %O A174281 1,1 %A A174281 _Vincenzo Librandi_, Mar 15 2010