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 A319740 #28 Jan 04 2019 10:49:42
%S A319740 1,3,1,7,6,1,8,5,7,9,7,9,3,0,1,6,1,0,5,4,5,9,3,9,9,0,3,1,3,8,6,5,2,1,
%T A319740 9,3,3,2,8,3,4,4,6,3,5,0,0,9,7,2,8,2,5,7,3,4,8,5,9,3,0,9,2,9,1,2,1,8,
%U A319740 5,8,7,3,3,0,5,7,4,6,4,2,5,0,3,5,5,9,4,7,1,3
%N A319740 The 10-adic integer cube root of one eleventh (1/11), that is, satisfying 11 * x^3 == 1 (mod 10^n), for all n.
%H A319740 Robert Israel, <a href="/A319740/b319740.txt">Table of n, a(n) for n = 1..10000</a>
%e A319740 45016103979758167131^3 * 11 == 1 (mod 10^20).
%p A319740 op([1,3], padic:-rootp(11*x^3-1,10,100)); # _Robert Israel_, Jan 03 2019
%o A319740 (PARI) seq(n)={Vecrev(digits(lift(chinese( Mod((1/11 + O(5^n))^(1/3), 5^n), Mod((1/11 + O(2^n))^(1/3), 2^n)))), n)} \\ _Andrew Howroyd_, Nov 26 2018
%Y A319740 Cf. A225402, A225411, A225412 (10-adic cube root of -1/3, 1/3, 1/9).
%K A319740 nonn,base,easy
%O A319740 1,2
%A A319740 _Patrick A. Thomas_, Sep 26 2018
%E A319740 Terms a(56) and beyond from _Andrew Howroyd_, Nov 26 2018