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 A277056 #11 Oct 08 2016 16:55:49 %S A277056 2,5,7,34,195,727,3724,9124,92115,338161,2780514,6871290,99000993 %N A277056 Least k such that any sufficiently long repunit multiplied by k is a pandigital number in numerical base n. %C A277056 Trailing terms of rows of A277055. %C A277056 Written in base n, the terms read: 10, 12, 13, 114, 523, 2056, 7214, 13457, 92115, 21107A, B21116, 156776A, D211117, ... %F A277056 Conjecture: for even n>4, a(n) = (n-2)*n^(n/2-1) + n^(n/2-2) + (n^(n/2)-1)/(n-1) + n/2 - 1. %e A277056 Any binary repunit multiplied by 2 is a binary pandigital, so a(2)=2 (10 in binary). %e A277056 k-th decimal repunit for k>4 multiplied by 92115 gives a decimal pandigital number (see A277054) with no number less than 92115 having the same property, so a(10)=92115. %Y A277056 Cf. A002275, A171102, A277054, A277055, A277059. %K A277056 nonn,base,more %O A277056 2,1 %A A277056 _Andrey Zabolotskiy_ and _Altug Alkan_, Sep 26 2016