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 A023331 #26 Sep 08 2022 08:44:47 %S A023331 47,67,1427,6047,12097,16057,44507,76537,92387,100057,132707,209647, %T A023331 263387,354247,407947,465407,477727,507757,775237,787477,788687, %U A023331 865327,907367,955457,1015517,1121387,1178197,1302277,1360367,1524247,1623707 %N A023331 Primes that remain prime through 5 iterations of function f(x) = 2x + 3. %C A023331 Primes p such that 2*p+3, 4*p+9, 8*p+21, 16*p+45 and 32*p+93 are also prime. - _Vincenzo Librandi_, Aug 04 2010 %C A023331 Subsequence of A023303. - _Michel Marcus_, Jun 25 2014 %H A023331 Vincenzo Librandi, <a href="/A023331/b023331.txt">Table of n, a(n) for n = 1..148</a> %t A023331 Select[Prime[Range[20000]], And@@PrimeQ[NestList[2 # + 3 &, #, 5]] &] (* _Vincenzo Librandi_, Jun 25 2014 *) %o A023331 (Magma) [p: p in PrimesUpTo(2000000) | IsPrime(2*p+3) and IsPrime(4*p+9) and IsPrime(8*p+21) and IsPrime(16*p+45) and IsPrime(32*p+93)]; // _Vincenzo Librandi_, Aug 04 2010 %Y A023331 Cf. A023303 (through 4 iterations). %K A023331 nonn %O A023331 1,1 %A A023331 _David W. Wilson_