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 A128683 #18 Jun 08 2021 02:22:40 %S A128683 1,11,253,11891,35167,45023,47927,96569,276859,640343,1035529,1102321, %T A128683 1652849,2221087,6367757,16339367,19588019,26499979,30096121,48669863, %U A128683 51809087,74901409,88023001,89007677,104391089,105080767,143938531 %N A128683 Numbers k such that k^3 divides 10^(k^2) + 1. %C A128683 11 divides a(n) for n > 1. %H A128683 Chai Wah Wu, <a href="/A128683/b128683.txt">Table of n, a(n) for n = 1..92</a> %t A128683 Select[Range[5*10^6], Mod[ 10^(#^2)+1, #^3]==0 &] (* _G. C. Greubel_, Jan 18 2018 *) %Y A128683 Cf. A127263, A128677, A128678, A128679, A128680, A128681, A128682, A128684, A128685, A292335. %K A128683 hard,nonn %O A128683 1,2 %A A128683 _Alexander Adamchuk_, Mar 31 2007 %E A128683 More terms from J. Mulder (jasper.mulder(AT)planet.nl), Jan 26 2010 %E A128683 Terms a(16) onward from _Max Alekseyev_ and _Alexander Adamchuk_, May 12 2010