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 A230868 #34 Sep 09 2024 15:11:05 %S A230868 1,2,4,9,15,165,317,488442,976572,7629882822,15258789078 %N A230868 Exponent of leading power of 5 in A230867(n). %C A230868 The next term, a(13) = (5^((5^4+5^2+10)/4)+5^((5^2+5)/2)+2*5^2+12)/4 = %C A230868 53455294201843912922810729343029637576303937602100973959238749843207972\ %C A230868 81974260717340996507118688896298416137695328. %H A230868 Pontus von Brömssen, <a href="/A230868/b230868.txt">Table of n, a(n) for n = 2..16</a> (based on Alekseyev's Table of expressions for a(n)) %H A230868 Max Alekseyev, <a href="/A230868/a230868.txt">Table of expressions for a(n), for n=2..100</a> %H A230868 Max A. Alekseyev and N. J. A. Sloane, <a href="https://arxiv.org/abs/2112.14365">On Kaprekar's Junction Numbers</a>, arXiv:2112.14365, 2021; Journal of Combinatorics and Number Theory 12:3 (2022), 115-155. %e A230868 A230867(5) = 1953134 = 5^9 + 9, so a(5) = 9. %Y A230868 Cf. A230867. %K A230868 nonn,base %O A230868 2,2 %A A230868 _N. J. A. Sloane_, Nov 05 2013 %E A230868 Terms a(9) onward from _Max Alekseyev_, Nov 05 2013