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 A216142 #14 Oct 03 2012 14:56:36 %S A216142 10797,9347,10797,9858,7550,8503,8031,9347,4,7175,8708,9739,7391,7707, %T A216142 10797,5653,8536,8530,4,6438,6795,7674,8283,5290,9127,9347,6702,7210, %U A216142 5,7125,7446,10462,7508,8061,7550,6706,5184,7226,5,5934,8607,8624,8663,5484 %N A216142 Conjectured number of digits in highest power of n with no four consecutive identical digits. %C A216142 The number of decimal digits in n^k is equal to A055642(n^k) = floor(1+k*log_10(n)). - _V. Raman_, Sep 27 2012 %Y A216142 Cf. A216063, A216064, A216065. %K A216142 nonn,base %O A216142 2,1 %A A216142 _V. Raman_, Sep 01 2012