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 A100972 #12 Feb 16 2025 08:32:55 %S A100972 11475,18655,20565,29631,31725,45387,58404,58667,59950,63945,67525, %T A100972 68904,91245,99603,125543,135196,141141,148645,149575,168270,175577, %U A100972 204611,207230,237540,240006,240787,275429,287950,321867,338709,358984 %N A100972 Integers that are Rhonda numbers to base 14. %C A100972 See sequence A099542 for definition of Rhonda numbers and for some links. %H A100972 Reinhard Zumkeller, <a href="/A100972/b100972.txt">Table of n, a(n) for n = 1..1000</a> %H A100972 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/RhondaNumber.html">Rhonda Number</a> %e A100972 The product of the base 14 digits of 11475 is 4*2*7*9=504, the sum of the prime factors of 11475 is 3*3+2*5+17=46 and 504=14*36, so 11475 is a Rhonda number to base 14. %o A100972 (Haskell) %o A100972 a100972 n = a100972_list !! (n-1) %o A100972 a100972_list = filter (rhonda 14) $ iterate z 1 where %o A100972 z x = 1 + if r < 13 then x else 14 * z x' where (x', r) = divMod x 14 %o A100972 -- Function rhonda as in A099542. %o A100972 -- _Reinhard Zumkeller_, Mar 07 2015 %Y A100972 Cf. Rhonda numbers to other bases: A100968 (base 4), A100969 (base 6), A100970 (base 8), A100973 (base 9), A099542 (base 10), A100971 (base 12), A100974 (base 15), A100975 (base 16), A255735 (base 18), A255732 (base 20), A255736 (base 30), A255731 (base 60). %Y A100972 Cf. A001414, A027746, A255872. %Y A100972 Column k=7 of A291925. %K A100972 easy,nonn,base %O A100972 1,1 %A A100972 Mark Hudson (mrmarkhudson(AT)hotmail.com), Nov 25 2004