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 A023214 #32 Sep 08 2022 08:44:47 %S A023214 2,3,17,23,47,59,83,101,107,113,149,167,191,233,251,257,281,311,401, %T A023214 443,449,467,503,521,569,593,617,647,653,677,761,827,839,857,863,881, %U A023214 941,947,971,1013,1031,1049,1109,1163,1181,1277,1301,1307,1319,1361,1409,1433 %N A023214 Primes p such that 4*p + 5 is also prime. %C A023214 Except for the first two terms, all terms are congruent to 5 (mod 6). - _John Cerkan_, Sep 07 2016 %H A023214 John Cerkan, <a href="/A023214/b023214.txt">Table of n, a(n) for n = 1..10000</a> %p A023214 A023214:=n->`if`(isprime(n) and isprime(4*n+5), n, NULL): seq(A023214(n), n=1..3*10^3); # _Wesley Ivan Hurt_, Sep 07 2016 %t A023214 Select[Prime[Range[250]],PrimeQ[4#+5]&] (* _Harvey P. Dale_, Oct 21 2018 *) %o A023214 (Magma) [n: n in [0..100000] | IsPrime(n) and IsPrime(4*n+5)] // _Vincenzo Librandi_, Aug 04 2010 %Y A023214 Subsequence of A111215. - _Michel Marcus_, Jul 08 2016 %K A023214 nonn %O A023214 1,1 %A A023214 _David W. Wilson_