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 A067703 #11 Jun 16 2013 14:16:09 %S A067703 2857,57,1,22857,457,9,182857,3657,73,1462857,29257,585,11702857, %T A067703 234057,4681,93622857,1872457,37449,748982857,14979657,299593, %U A067703 5991862857,119837257,2396745,47934902857,958698057,19173961 %N A067703 Terms in the decimal expansion of 1/(7*5^n) before the block of decimals 142857 (the period of 1/7) appears. %C A067703 Example: 1/(7*5^4)=0.00022857(142857) hence a(4)=22857 %F A067703 Empirical g.f.: x*(-56*x^2-2800*x+2857) / (8*x^4-8*x^3-x+1). - _Colin Barker_, Jun 16 2013 %o A067703 (PARI) a(n)=if(n<0, 0, s=1; while(frac(10^s/7/5^n-1/7)>0, s++); floor(10^s/7/5^n)) \\ _Colin Barker_, Jun 16 2013 %Y A067703 Cf. A067556. %K A067703 nonn,base %O A067703 1,1 %A A067703 _Benoit Cloitre_, Feb 05 2002; revised Dec 11, 2004 %E A067703 a(12) corrected by _Colin Barker_, Jun 16 2013