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 A259571 #26 Jul 06 2015 20:20:57 %S A259571 3,7,8,17,23,27,38,39,43,48,58,65,66,67,68,69,74,75,76,77,78,83,84,88, %T A259571 89,91,92,93,98,99,105,110,113,140,156,157,170,182,186,188,191,194, %U A259571 205,212,215,218,222,227,229,234,235,241,246,247,252,267,287,293,294 %N A259571 Numbers n whose square root contains at least one instance of n in the first n digits after the decimal point. %C A259571 Numbers beginning with a nine are most likely to have this property, and numbers beginning with a one are least likely. No squares have it. %H A259571 Andreas Boe, <a href="/A259571/b259571.txt">Table of n, a(n) for n = 1..551</a> %e A259571 sqrt(17) = 4.12310562561766054... The first 17 digits after the decimal point contain "17". %t A259571 Select[Range@ 301, ! StringFreeQ[ToString@ FromDigits@ First@ RealDigits@ N[Sqrt@ #, #], ToString@ #] &] // Rest (* _Michael De Vlieger_, Jul 02 2015 *) %K A259571 nonn,base %O A259571 1,1 %A A259571 _Andreas Boe_, Jun 30 2015