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 A023249 #21 Sep 08 2022 08:44:47 %S A023249 3,7,11,17,19,47,67,109,149,151,199,227,233,347,353,359,397,431,457, %T A023249 487,563,571,577,607,709,809,919,947,997,1013,1033,1069,1103,1117, %U A023249 1151,1187,1279,1361,1367,1451,1601,1607,1697,1699,1801,1811,1823,1831,1871,1913 %N A023249 Primes that remain prime through 2 iterations of function f(x) = 3x + 10. %C A023249 Primes p such that 3*p+10 and 9*p+40 are also primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023249 John Cerkan, <a href="/A023249/b023249.txt">Table of n, a(n) for n = 1..10000</a> %t A023249 Select[Range@ 2000, Times @@ Boole@ PrimeQ@ NestList[3 # + 10 &, #, 2] > 0 &] (* _Michael De Vlieger_, Sep 13 2016 *) %o A023249 (Magma) [n: n in [0..100000] | IsPrime(n) and IsPrime(3*n+10) and IsPrime(9*n+40)] // _Vincenzo Librandi_, Aug 04 2010 %Y A023249 Subsequence of A023211. %K A023249 nonn %O A023249 1,1 %A A023249 _David W. Wilson_