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 A299912 #16 Dec 22 2024 10:51:56 %S A299912 -1,-1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, %T A299912 1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, %U A299912 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 %N A299912 a(n) = a056240-type of n-th prime, or -1 if the a056240-type is not defined. %C A299912 For the definition of the a056240-type of a prime, see A293652, which also gives the smallest prime of a056240-type k for k = 1, 2, 3, .... %H A299912 Michel Marcus, <a href="/A299912/b299912.txt">Table of n, a(n) for n = 1..5001</a> %H A299912 Michel Marcus, <a href="/A299912/a299912.gp.txt">PARI/GP program</a> %o A299912 (PARI) \\ See Marcus link. %Y A299912 Cf. A056240, A293652. %Y A299912 For primes of a056240-types 2 and 3 see A300334 and A300359. %K A299912 sign %O A299912 1,47 %A A299912 _N. J. A. Sloane_, Mar 10 2018