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 A027663 #17 Aug 01 2022 22:04:06
%S A027663 100000,141421,173205,200000,223607,244949,264575,282843,300000,
%T A027663 316228,331662,346410,360555,374166,387298,400000,412311,424264,
%U A027663 435890,447214,458258,469042,479583,489898,500000,509902,519615,529150,538516,547723,556776,565685,574456
%N A027663 a(n)/100000 gives sqrt(n) to 5 places after the decimal point.
%p A027663 lprint(round(evalf(100000*sqrt(n))));
%t A027663 Table[Floor[FromDigits[RealDigits[Sqrt[n],10,7][[1]]]/10+1/2],{n,30}] (* _Harvey P. Dale_, Jan 31 2012 *)
%o A027663 (Python)
%o A027663 from math import isqrt
%o A027663 def A027663(n): return (m:=isqrt(k:=n*10**10))+int((k-m*(m+1)<<2)>=1) # _Chai Wah Wu_, Jul 30 2022
%Y A027663 Cf. A027662, A027664.
%K A027663 nonn,base
%O A027663 1,1
%A A027663 _N. J. A. Sloane_