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 A081414 #12 Jun 04 2024 01:26:02 %S A081414 1,2,2,2,3,3,2,2,2,2,3,3,3,5,2,3,3,2,3,2,13,5,17,2,5,5,5,2,5,3,7,2,3, %T A081414 11,3,3,13,5,11,2,5,3,3,5,7,2,3,3,2,7,2,5,7,3,7,37,7,5,17,7,11,11,13, %U A081414 3,3,3,43,43,3,3,7,3,5,3,5,11,3,5,3 %N A081414 Largest prime divisor of prime(2^n+1) - prime(2^n). %F A081414 a(n) = A006530(A001223(A000079(n))) = A081412(2^n) = A006530(A074325(n)). %Y A081414 Cf. A006530, A001223, A000079, A081412, A081413, A074325. %K A081414 nonn %O A081414 0,2 %A A081414 _Labos Elemer_, Apr 02 2003 %E A081414 Three more terms from _Max Alekseyev_, May 15 2009 %E A081414 Offset changed to 0, a(0) prepended and more terms added by _Amiram Eldar_, Jun 04 2024