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 A023318 #18 Sep 08 2022 08:44:47 %S A023318 1319,2699,4259,4919,5689,8669,10159,10529,29819,33119,82339,86689, %T A023318 98669,174079,177949,196739,207869,210599,222499,231809,253369,267299, %U A023318 275699,323699,362459,371639,378179,388529,397799,402529,421079,448859,468499 %N A023318 Primes that remain prime through 4 iterations of function f(x) = 7x + 6. %C A023318 Primes p such that 7*p+6, 49*p+48, 343*p+342 and 2401*p+2400 are also primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023318 John Cerkan, <a href="/A023318/b023318.txt">Table of n, a(n) for n = 1..10000</a> %F A023318 a(n) == 9 (mod 10). - _John Cerkan_, Oct 08 2016 %o A023318 (Magma) [n: n in [1..1000000] | IsPrime(n) and IsPrime(7*n+6) and IsPrime(49*n+48) and IsPrime(343*n+342) and IsPrime(2401*n+2400)] // _Vincenzo Librandi_, Aug 04 2010 %Y A023318 Subsequence of A023225, A023259, A023290, and A024900. %K A023318 nonn %O A023318 1,1 %A A023318 _David W. Wilson_