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 A309987 #12 Aug 26 2019 12:31:16 %S A309987 1,1,4,2,0,3,2,4,3,4,2,4,0,1,1,3,3,4,5,1,0,0,1,4,5,3,3,6,6,4,5,6,2,4, %T A309987 3,6,2,4,5,1,0,3,2,3,5,5,2,1,3,4,3,2,5,2,5,4,1,5,6,2,1,4,0,5,0,1,6,2, %U A309987 0,6,0,4,4,2,1,5,0,4,4,5,5,4,5,1,5,1,0,5 %N A309987 Digits of the 7-adic integer exp(7). %C A309987 Digits of the multiplicative inverse of A309988. %H A309987 Wikipedia, <a href="https://en.wikipedia.org/wiki/P-adic_number">p-adic number</a> %o A309987 (PARI) a(n) = lift(exp(7+O(7^(n+1))))\7^n %Y A309987 Cf. A309904. %Y A309987 Digits of exp(p) in p-adic field: A317675 (p=3), A309888 (p=5), this sequence (p=7). %K A309987 nonn,base %O A309987 0,3 %A A309987 _Jianing Song_, Aug 26 2019