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 A222811 #29 Jan 09 2025 10:16:23 %S A222811 9,18,111,212,1128,2067,11123,20270,110440,200971,1101475,2003592, %T A222811 11005388 %N A222811 Number of n-digit numbers N such that the reversal of N divides N. %C A222811 Suggested by A214927. %C A222811 Even terms are roughly double the previous term. - _David Consiglio, Jr._, Mar 22 2013 %H A222811 David Consiglio, Jr., <a href="/A222811/a222811.txt">C++ program</a> %H A222811 N. J. A. Sloane, <a href="http://arxiv.org/abs/1307.0453">2178 And All That</a>, Fib. Quart., 52 (2014), 99-120. %H A222811 N. J. A. Sloane, <a href="/A001232/a001232.pdf">2178 And All That</a> [Local copy] %e A222811 Some of the smallest solutions are: %e A222811 [1, 2, 3, 4, 5, 6, 7, 8, 9] (so a(1) = 9), %e A222811 [10, 11, 20, 22, 30, 33, 40, 44, 50, 55, 60, 66, 70, 77, 80, 88, 90, 99] (so a(2) = 18), %e A222811 [100, 101, 110, 111, 121, 131, 141, 151, 161, 171, 181, 191, 200, 202, 212, 220, 222, 232, 242, 252, 262, 272, 282, 292, 300, 303, 313, 323, 330, 333, 343, 353, ...] %Y A222811 Cf. A214927, A222809, A222810, A222812. %K A222811 nonn,base,more %O A222811 1,1 %A A222811 _N. J. A. Sloane_, Mar 10 2013 %E A222811 a(8) - a(11) from _David Consiglio, Jr._, Mar 22 2013 %E A222811 a(12)-a(13) from _Giovanni Resta_, Apr 01 2013