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 A140479 #9 Jul 18 2013 02:47:00 %S A140479 0,0,3,8,14,23,34,47,62,79,97,118,141,166,193,222,253,286,321,358,397, %T A140479 438,481,526,573,622,673,726,781,838,897,958,1020,1085,1152,1221,1292, %U A140479 1365,1440,1517,1596,1677,1760,1845,1932,2021,2112,2205,2300,2397,2496,2597 %N A140479 n^2 - number of digits of n^2. %F A140479 a(n) = A000290(n) - A055642(A000290(n)). _Michel Marcus_, Jul 18 2013 %o A140479 (PARI) a(n) = n^2 - length(digits(n^2)) \\ _Michel Marcus_, Jul 18 2013 %K A140479 nonn,base %O A140479 0,3 %A A140479 _Rolf Pleisch_, Jun 29 2008 %E A140479 Corrected and extended by _N. J. A. Sloane_, Jun 29 2008