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 A053751 #19 May 31 2021 10:09:36 %S A053751 14,30,40,48,57,67,97,100,121,140,157,167,210,225,233,236,243,289,300, %T A053751 302,307,321,344,352,406,408,413,430,440,453,459,464,469,476,479,487, %U A053751 507,539,541,545,549,557,560,561 %N A053751 Positions of 7's in the decimal expansion of Pi. %H A053751 Vincenzo Librandi, <a href="/A053751/b053751.txt">Table of n, a(n) for n = 1..1000</a> %H A053751 <a href="/index/Ph#Pi314">Index entries for sequences related to the number Pi</a> %F A053751 a(n) = A036974(n) + 1. - _Georg Fischer_, May 31 2021 %t A053751 Flatten[Position[RealDigits[Pi, 10, 1000][[1]], 7]] (* _Vincenzo Librandi_, Oct 07 2013 *) %Y A053751 Cf. A036974. %K A053751 nonn,base %O A053751 1,1 %A A053751 _Simon Plouffe_, Feb 20 2000