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 A175171 #12 Sep 09 2024 15:12:35 %S A175171 2,3,7,11,43,103,827,7559,26459,164987 %N A175171 Primes p such that 3*2^p-1 is also prime. %C A175171 These are the primes in A002235. [_R. J. Mathar_, May 02 2010] %e A175171 For p=2, 3*2^2-1=11; p=3, 3*2^3-1=23; p=7, 3*2^7-1=383 %o A175171 (Magma) [p: p in PrimesUpTo(7000) | IsPrime(3*2^p-1) ]; %Y A175171 Cf. A002235. %K A175171 nonn,more %O A175171 1,1 %A A175171 _Vincenzo Librandi_, Mar 09 2010 %E A175171 3 more terms from _R. J. Mathar_, May 02 2010