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 A189893 #7 Nov 02 2013 19:14:30
%S A189893 0,4,10,65,173,22,96,15,48,78,13,201,487,594,2719,5146,8719,11530,
%T A189893 15308,76411,76016,42220,67129,45349,170266,255576,457846,865810,
%U A189893 1131083,8045547,7669757
%N A189893 Recurrence sequence derived from the digits of the square root of 5 after its decimal point.
%F A189893 a(0) = 0; for i >= 0, a(i+1) = position of first occurrence of a(i) in decimal places of sqrt(5).
%e A189893 sqrt(5) = 2.2360679774997896964091736687...
%e A189893 So for example, with a(0) = 0, a(1) = 4 because the 4th digit after the decimal point is 0; a(2) = 10 because the 10th digit after the decimal point is 4 and so on.
%p A189893 with(StringTools): Digits:=10000: G:=convert(evalf(sqrt(5)),string): a[0]:=0: for n from 1 to 17 do a[n]:=Search(convert(a[n-1],string), G)-2:printf("%d, ",a[n-1]):od:
%Y A189893 Other recurrence sequences: A097614 for Pi, A098266 for e, A098289 for log(2), A098290 for Zeta(3), A098319 for 1/Pi, A098320 for 1/e, A098321 for gamma, A098322 for G, A098323 for 1/G, A098324 for Golden Ratio (phi), A098325 for sqrt(Pi), A098326 for sqrt(2), A120482 for sqrt(3), A098327 for sqrt(e), A098328 for 2^(1/3).
%K A189893 base,nonn,more
%O A189893 0,2
%A A189893 _Nathaniel Johnston_, Apr 30 2011