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 A344361 #26 Jul 27 2021 12:28:12 %S A344361 5,7,349,1123,25447 %N A344361 Primes p such that (2^p-2)/p - 1 is prime. %C A344361 a(6) > 1199999, if it exists. - _Karl-Heinz Hofmann_, Jul 27 2021 %e A344361 7 is a term because (2^7-2)/7 - 1 = 17 is prime. %o A344361 (PARI) is(p) = isprime(p) && ispseudoprime((2^p-2)/p-1) \\ _Jinyuan Wang_, May 15 2021 %Y A344361 Cf. A064535, A344360. %K A344361 nonn,more %O A344361 1,1 %A A344361 _Jorge Coveiro_, May 15 2021 %E A344361 a(5) from _Hugo Pfoertner_, May 17 2021