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 A201132 #6 Mar 30 2012 18:36:00
%S A201132 1,1,11,1,17,11,5,25,43,25,49,29,25,19,1,1,55,41,95,19,11,49,91,1,83,
%T A201132 115,17,17,119,151,253,77,293,77,35,41,29,295,5,23,433,149,61,173,113,
%U A201132 101,77,109,19,161,5,85,53,443,61,151,1,253,77,37,55,251,163
%N A201132 Least k such that (5^n - k)*5^n - 1 is a prime number.
%t A201132 Table[k = 0; While[!PrimeQ[(5^n - k)*5^n - 1], k++]; k, {n, 85}]
%Y A201132 Cf. A191620, A200922.
%K A201132 nonn
%O A201132 1,3
%A A201132 _Michel Lagneau_, Nov 27 2011