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 A057899 #2 Mar 30 2012 18:51:28 %S A057899 2,2,4,5,2,7,3,9,10,11,12,2,14,4,16,17,18,19,20,21,22,23,5,3,26,27,2, %T A057899 29,30,31,32,33,34,6,36,37,38,39,40,41,42,43,44,45,46,47,7,49,50,51, %U A057899 52,53,54,55,56,57,58,2,60,61,4,8,64,65,66,67,68,69,70,71,72,73,74,75,76 %N A057899 Smallest positive integer such that n=a(n)^k-k with k a positive integer. %C A057899 It may be that positive integers can be written as n=m^k-k (with m and k > 1) in at most one way [checked up to 10000] as well as with k=1 and m=n+1. %F A057899 a(n) = (n+A057898(n))^(1/A057898(n)). %e A057899 a(5)=2 since 5=2^3-3 %Y A057899 Cf. A057897, A057898. %K A057899 nonn %O A057899 1,1 %A A057899 _Henry Bottomley_, Sep 26 2000