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 A023348 #21 Sep 08 2022 08:44:47 %S A023348 774791,924731,4593221,5181641,9905521,11523361,11755831,12253321, %T A023348 14078711,14545331,14928791,18523361,18686531,24169001,25614361, %U A023348 26221051,26834461,30970201,33446521,40051021,42888191,43703201,47528561,48653951 %N A023348 Primes that remain prime through 5 iterations of function f(x) = 8x + 3. %C A023348 Primes p such that 8*p+3, 64*p+27, 512*p+219, 4096*p+1755 and 32768*p+14043 are also primes. - _Vincenzo Librandi_, Aug 05 2010 %H A023348 John Cerkan, <a href="/A023348/b023348.txt">Table of n, a(n) for n = 1..10000</a> %F A023348 a(n) == 31 (mod 70). - _John Cerkan_, Nov 04 2016 %t A023348 n5Q[n_]:=And@@PrimeQ/@NestList[8#+3&,n,5]; Select[Prime[Range[ 3000000]], n5Q] (* _Harvey P. Dale_, Sep 03 2013 *) %o A023348 (Magma) [n: n in [1..19000000] | IsPrime(n) and IsPrime(8*n+3) and IsPrime(64*n+27) and IsPrime(512*n+219) and IsPrime(4096*n+1755) and IsPrime(32768*n+14043)] // _Vincenzo Librandi_, Aug 05 2010 %Y A023348 Subsequence of A005124, A023229, A023261, A023292, and A023320. %K A023348 nonn %O A023348 1,1 %A A023348 _David W. Wilson_