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 A023314 #23 Jul 26 2025 14:37:44 %S A023314 263,1217,2141,4673,5333,6983,10973,11423,26669,27143,28697,74843, %T A023314 85061,101063,102647,114113,121001,133349,141623,150497,154823,199877, %U A023314 200183,202409,203039,207953,259697,259781,275813,280487,294167,305477,322727 %N A023314 Primes that remain prime through 4 iterations of function f(x) = 5x + 4. %C A023314 Primes p such that 5*p+4, 25*p+24, 125*p+124 and 625*p+624 are also primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023314 John Cerkan, <a href="/A023314/b023314.txt">Table of n, a(n) for n = 1..10000</a> %F A023314 a(n) == 11 or 41 (mod 42). - _John Cerkan_, Oct 07 2016 %o A023314 (Magma) [n: n in [1..1000000] | IsPrime(n) and IsPrime(5*n+4) and IsPrime(25*n+24) and IsPrime(125*n+124) and IsPrime(625*n+624)]; // _Vincenzo Librandi_, Aug 04 2010 %Y A023314 Subsequence of A023218, A023253, A023284, and A024897. %K A023314 nonn %O A023314 1,1 %A A023314 _David W. Wilson_