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 A309975 #18 Aug 26 2019 11:22:21 %S A309975 1,4,2,1,3,0,2,4,1,4,1,0,4,0,4,2,1,1,4,4,2,2,3,2,2,4,3,4,4,2,0,0,1,0, %T A309975 4,3,2,1,3,2,0,4,3,2,4,4,1,4,0,0,4,3,4,3,0,4,3,4,1,2,4,1,3,3,3,4,3,2, %U A309975 4,4,3,2,4,4,3,2,4,3,4,2,2,2,0,2,3,1,3,2 %N A309975 Digits of the 5-adic integer exp(-5). %C A309975 Digits of the multiplicative inverse of A309888. %H A309975 Wikipedia, <a href="https://en.wikipedia.org/wiki/P-adic_number">p-adic number</a> %o A309975 (PARI) a(n) = lift(exp(-5+O(5^(n+1))))\5^n %Y A309975 Cf. A309903. %Y A309975 Digits of exp(-p) in p-adic field: A309866 (p=3), this sequence (p=5), A309988 (p=7). %K A309975 nonn,base %O A309975 0,2 %A A309975 _Jianing Song_, Aug 26 2019