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 A092188 #21 Aug 11 2014 22:45:24 %S A092188 2,2,4,2,2,1,8,8,2,2,8,5,8,2,16,2,8,18,12,8,2,16,8,2,18,26,8,11,2,2, %T A092188 32,2,2,22,8,31,18,5,32,2,8,27,24,17,16,8,32,43,2,2,44,45,26,2,8,56, %U A092188 40,47,32,33,2,8,64,57,2,5,36,62,22,60,8,1,68,2,56,57,44,8,32,80,2,2,8,2,70 %N A092188 a(n) = smallest positive integer m such that 2^3^4^5^...^n == m (mod n). %H A092188 Max Alekseyev, <a href="/A092188/b092188.txt">Table of n, a(n) for n = 2..1000</a> %H A092188 R. Munafo, <a href="http://www.mrob.com/pub/math/seq-a092188.html">Smallest positive integer m such that 2^3^4^5^...^n == m mod n</a> %F A092188 a(n) = n if n is a power of 2; otherwise a(n) = (2^3^4^5^...^n) mod n = A213013(n). [From _Max Alekseyev_, Jun 02 2012] %e A092188 2^3^4^5 = 2^3^1024. But 3 == -1 (mod 4), so 3^1024 == 1 (mod 4), so 2^3^1024 == 2^1 (mod 5) since 2^4 == 1 (mod 5). Thus a(5) = 2. %K A092188 nonn,nice %O A092188 2,1 %A A092188 _N. J. A. Sloane_, following a suggestion of _J. H. Conway_, Apr 02 2004 %E A092188 More terms from _Robert Munafo_, Apr 11 2004