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 A248082 #7 Oct 04 2014 18:11:53 %S A248082 3,2,6,2,4,30,0,27,4,9,109,14,0,70,58,208,12,65,0,172,1579,1639,585, %T A248082 208,0,494,505,79,3630,95,0,81,4422,130,1648,3,0,13030,174,3,627,9524, %U A248082 0,3858,1369,1235,11340,6411,0,35494,2553,4883,412,44366,0,14640,101386,44021,3003,13045 %N A248082 Least number k such that k^n - k +/- 1 are twin primes, or 0 if no such k exists. %C A248082 For n > 2, if n == 2 (mod 6), then k^n - k + 1 is divisible by k^2 - k + 1. Thus it will never be prime. %o A248082 (PARI) %o A248082 a(n)=if(n>2&&n==Mod(2,6),return(0));k=1;while(!ispseudoprime(k^n-k+1)||!ispseudoprime(k^n-k-1),k++);k %o A248082 n=2;while(n<100,print1(a(n),", ");n++) %Y A248082 Cf. A131530, A236524, A236763. %K A248082 nonn %O A248082 2,1 %A A248082 _Derek Orr_, Sep 30 2014