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 A338792 #10 Nov 09 2020 21:34:11 %S A338792 1,2,5,12,26,13,4,52,21,28693,1128,2431,1221,16,71954,11,7,153888,8, %T A338792 27417323062119920,496,14,9,223378173194137397198,5760923,2403,149, %U A338792 134,10,452,47,406,71,19,27,20,37607875619,150886,22544062111497849 %N A338792 a(n) is the least number k such that 1/prime(k) has repeating decimal expansion of period n. %H A338792 <a href="/index/1#1overn">Index entries for sequences related to decimal expansion of 1/n</a> %F A338792 a(0) = 1; a(n) = A000720(A007138(n)). %e A338792 1/prime(1) = 1/2 = 0.5 (finite decimal expansion). %e A338792 1/prime(2) = 1/3 = 0.3(3)... (period 1). %e A338792 1/prime(5) = 1/11 = 0.09(09)... (period 2). %e A338792 1/prime(12) = 1/37 = 0.027(027)... (period 3). %Y A338792 Cf. A000720, A002371, A003060, A007138. %K A338792 nonn,base %O A338792 0,2 %A A338792 _Ilya Gutkovskiy_, Nov 09 2020 %E A338792 a(19)-a(38) from _Daniel Suteu_, Nov 09 2020 [using data from A007138 and A234317]