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 A260463 #14 Aug 17 2015 15:38:47 %S A260463 1,5,6,2,23,8,27,9,3,10,34,11,37,12,39,4,42,43,14,45,46,15,48,49,16, %T A260463 51,52,17,54,55,56,18,58,59,188,19,61,62,63,20,203,65,66,21,213,68,69, %U A260463 22,7,71,72,229,73,74,235,75,24,241,77,78,247,25,251,80,81,257,26,83,263,84,267,85,86,273,87,276,88,28,89 %N A260463 a(n) is the smallest number not already in the sequence such that a(n)^2 begins with n. %C A260463 Conjectured to be a permutation of the natural numbers. %C A260463 Differs from A018851 at n = 25. %H A260463 Derek Orr, <a href="/A260463/b260463.txt">Table of n, a(n) for n = 1..10000</a> %F A260463 a(n) >= sqrt(n) for all n > 0. If a(n) = sqrt(n), then n is a square. Note the converse is false: a(25) = 16. %o A260463 (PARI) v=[];k=1;while(#v<100,d=digits(k^2);D=digits(#v+1);if(#D<=#d,c=1;for(i=1,#D,if(D[i]!=d[i],c=0;break));if(c&&!vecsearch(vecsort(v),k),v=concat(v,k);k=0));k++);v %Y A260463 Cf. A018851. %K A260463 nonn,base %O A260463 1,2 %A A260463 _Derek Orr_, Jul 26 2015