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 A157425 #4 May 01 2013 21:05:53 %S A157425 120,125,128,216,243,256,343,512,625,720,729,1000,1024,1089,1156,1225, %T A157425 1296,1331,1369,1444,1521,1600,1681,1728,1764,1849,1936,2025,2048, %U A157425 2116,2187,2197,2209,2304,2401,2500,2601,2704,2744,2809,2916,3025,3125,3136 %N A157425 Numbers which can be represented using fewer symbols than the number of decimal digits in the number. %C A157425 The "up-arrow" symbol is free, since that is indicated by a superscript. %C A157425 Additional terms are possible if the double factorial (!!) operator is permitted. [From _Sean A. Irvine_, Mar 14 2010] %e A157425 120=5!, 125=5^3, ..., 59050 = 9^5 + 1, ..., 1354984 = 9^6 + 7^7, ... %K A157425 base,nonn %O A157425 1,1 %A A157425 _Alan Frank_, Feb 28 2009 %E A157425 Edited by _N. J. A. Sloane_, Mar 27 2009 %E A157425 Corrected and extended by _Sean A. Irvine_, Mar 14 2010