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 A222816 #25 Jan 09 2025 10:19:56 %S A222816 8,48,144,208,248,744,1008,1248,3744,5008,5208,6048,6248,18744,25008, %T A222816 26208,30048,31248,90144,93744,125008,126008,130208,131208,150048, %U A222816 151048,155248,156248,450144,468744,625008,631008,650208,656208,750048,756048,775248,781248 %N A222816 Numbers k that divide the base-5 reversal of k. %C A222816 The base-B reversal of k is obtained by writing k in base B and reversing the order of the digits. %H A222816 N. J. A. Sloane, <a href="/A222816/b222816.txt">Table of n, a(n) for n = 1..57</a> %H A222816 Leonard F. Klosinski and Dennis C. Smolarski, <a href="http://www.jstor.org/stable/2688542">On the Reversing of Digits</a>, Math. Mag., 42 (1969), 208-210. [Gives a(1)] %H A222816 N. J. A. Sloane, <a href="http://arxiv.org/abs/1307.0453">2178 And All That</a>, arXiv:1307.0453 [math.NT], 2013; Fib. Quart., 52 (2014), 99-120. %H A222816 N. J. A. Sloane, <a href="/A001232/a001232.pdf">2178 And All That</a> [Local copy] %e A222816 8 in base 5 is 13_5; its reverse is 31_5, which is 16 in base 10, and 8 divides 16, so 8 is in the sequence. %t A222816 Select[Range[10^6],Divisible[s=FromDigits[Reverse@IntegerDigits[#,5],5],#]&&s!=#&] (* _Giorgos Kalogeropoulos_, Aug 20 2021 *) %o A222816 (PARI) isok(n) = (rdn = subst(Polrev(digits(n, 5)), x, 5)) && (rdn != n) && (rdn % n) == 0; \\ _Michel Marcus_, Oct 10 2014 %Y A222816 Cf. A214927, A091079. %K A222816 nonn,base %O A222816 1,1 %A A222816 _N. J. A. Sloane_, Mar 13 2013 %E A222816 More terms from _Alois P. Heinz_, Mar 13 2013