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 A023285 #27 Sep 08 2022 08:44:47 %S A023285 7,79,181,233,359,401,449,1009,1093,1259,1303,1373,1511,1931,2011, %T A023285 2339,2477,3019,3691,4349,4409,5417,5879,6301,6553,6637,7079,8329, %U A023285 9127,9137,10303,10499,11579,12391,13259,14251,15101,15107,15217,15329,15527,15679 %N A023285 Primes that remain prime through 3 iterations of function f(x) = 5x + 6. %C A023285 Primes p such that 5*p+6, 25*p+36 and 125*p+186 are also primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023285 John Cerkan, <a href="/A023285/b023285.txt">Table of n, a(n) for n = 1..10000</a> %t A023285 p3Q[n_]:=And@@PrimeQ/@NestList[5#+6&,n ,3]; Select[Prime[Range[2000]],p3Q] (* _Harvey P. Dale_, Feb 20 2011 *) %o A023285 (Magma) [n: n in [1..150000] | IsPrime(n) and IsPrime(5*n+6) and IsPrime(25*n+36) and IsPrime(125*n+186)] // _Vincenzo Librandi_, Aug 04 2010 %Y A023285 Subsequence of A023219, A023254, and of A081759. %K A023285 nonn %O A023285 1,1 %A A023285 _David W. Wilson_