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 A023345 #22 Sep 08 2022 08:44:47 %S A023345 13,4637,5849,5923,16183,16979,34919,36277,67003,79337,115571,159739, %T A023345 175141,245753,249133,305717,341569,359353,383833,437263,455317, %U A023345 498497,511519,567121,579961,581699,633797,683831,693431,849197,972197,1022449 %N A023345 Primes that remain prime through 5 iterations of function f(x) = 6x + 5. %C A023345 Primes p such that 6*p+5, 36*p+35, 216*p+215, 1296*p+1295 and 7776*p+7775 are also primes. - _Vincenzo Librandi_, Aug 05 2010 %H A023345 John Cerkan, <a href="/A023345/b023345.txt">Table of n, a(n) for n = 1..10000</a> %t A023345 Select[Range[1100000],And@@PrimeQ[NestList[6#+5&,#,5]]&] (* _Harvey P. Dale_, Mar 31 2012 *) %o A023345 (Magma) [n: n in [1..10000000] | IsPrime(n) and IsPrime(6*n+5) and IsPrime(36*n+35) and IsPrime(216*n+215) and IsPrime(1296*n+1295) and IsPrime(7776*n+7775)] // _Vincenzo Librandi_, Aug 05 2010 %Y A023345 Subsequence of A023221, A023257, A023288, A023317, and A059325. %K A023345 nonn %O A023345 1,1 %A A023345 _David W. Wilson_