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 A212528 #8 Jun 29 2012 18:55:59
%S A212528 6,0,714285,63,846153,7647058823529411,894736842105263157,
%T A212528 8260869565217391304347,7931034482758620689655172413,935483870967741,
%U A212528 837,90243,953488372093023255813,9148936170212765957446808510638297872340425531,8867924528301
%N A212528 The periodic part of the decimal expansion of prime(n-1) / prime(n).
%C A212528 Number of digits of the periodic parts for n>=3 in A002371, A048595 and A071126.
%H A212528 Jaroslav Krizek, <a href="/A212528/b212528.txt">Table of n, a(n) for n = 2..60</a>
%t A212528 Table[If[n == 3, 0, FromDigits[RealDigits[Prime[n-1]/Prime[n]][[1,1]]]], {n, 2, 10}]
%Y A212528 Cf. A002371, A048595, A071126.
%K A212528 nonn,base
%O A212528 2,1
%A A212528 _Jaroslav Krizek_, Jun 29 2012
%E A212528 Corrected by _T. D. Noe_, Jun 29 2012