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 A309988 #8 Aug 26 2019 11:23:16 %S A309988 1,6,3,4,2,3,5,3,2,0,1,4,1,1,0,5,3,2,3,4,0,0,5,6,1,1,1,0,6,1,2,2,2,5, %T A309988 2,4,2,4,3,1,6,2,0,6,6,4,2,2,5,3,2,5,0,3,0,6,1,1,2,2,1,1,0,1,3,4,2,6, %U A309988 4,3,1,4,1,4,3,1,2,6,0,4,3,5,4,4,1,4,2,1 %N A309988 Digits of the 7-adic integer exp(-7). %C A309988 Digits of the multiplicative inverse of A309987. %H A309988 Wikipedia, <a href="https://en.wikipedia.org/wiki/P-adic_number">p-adic number</a> %o A309988 (PARI) a(n) = lift(exp(-7+O(7^(n+1))))\7^n %Y A309988 Cf. A309905. %Y A309988 Digits of exp(-p) in p-adic field: A309866 (p=3), A309975 (p=5), this sequence (p=7). %K A309988 nonn,base %O A309988 0,2 %A A309988 _Jianing Song_, Aug 26 2019