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 A023290 #26 Aug 28 2024 14:44:51 %S A023290 149,439,1319,2069,2089,2389,2699,2819,4259,4919,5059,5689,6469,7559, %T A023290 8429,8669,9199,9239,9319,9769,10159,10529,14449,14479,17659,18899, %U A023290 19289,23879,25189,29819,33119,33149,34159,34439,35089,36229,38839,39829,40699 %N A023290 Primes that remain prime through 3 iterations of function f(x) = 7x + 6. %C A023290 Primes p such that 7*p+6, 49*p+48 and 343*p+342 are primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023290 John Cerkan, <a href="/A023290/b023290.txt">Table of n, a(n) for n = 1..10000</a> %F A023290 a(n) == 9 (mod 10). - _John Cerkan_, Sep 23 2016 %o A023290 (Magma) [n: n in [1..150000] | IsPrime(n) and IsPrime(7*n+6) and IsPrime(49*n+48) and IsPrime(343*n+342)]; // _Vincenzo Librandi_, Aug 04 2010 %Y A023290 Subsequence of A023225, A023259, and A024900. %K A023290 nonn %O A023290 1,1 %A A023290 _David W. Wilson_