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 A290798 #12 Aug 03 2019 08:34:20 %S A290798 3,2,6,2,1,1,5,2,4,0,1,4,5,3,6,0,0,0,2,0,0,2,2,0,1,2,6,3,2,2,2,6,5,3, %T A290798 4,4,6,0,5,1,5,2,6,0,4,5,6,6,0,5,1,5,6,2,3,3,0,2,6,5,5,0,1,4,1,5,2,0, %U A290798 2,2,1,6,5,2,4,0,5,4,6,0,0,3,3,1,4,4,6,5 %N A290798 Coefficients in 7-adic expansion of sqrt(-5). %H A290798 Seiichi Manyama, <a href="/A290798/b290798.txt">Table of n, a(n) for n = 0..10000</a> %o A290798 (PARI) Vecrev(digits(lift(sqrt(-5+O(7^99))), 7)) %Y A290798 Cf. A290799, A290806. %K A290798 nonn %O A290798 0,1 %A A290798 _Seiichi Manyama_, Aug 10 2017