cp's OEIS Frontend

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.

A358101 Positions of records in A358099, i.e., integers whose number of divisors whose decimal digits are in strictly decreasing order sets a new record.

This page as a plain text file.
%I A358101 #18 Nov 05 2022 05:47:22
%S A358101 1,2,4,6,12,20,30,40,60,120,240,360,420,840,1260,2520,5040,8640,10080,
%T A358101 15120,20160,30240,60480,120960,181440,362880,544320,786240,1572480,
%U A358101 1874880,3749760,5624640,7862400,14938560,23587200,24373440,31872960,63745920,95618880
%N A358101 Positions of records in A358099, i.e., integers whose number of divisors whose decimal digits are in strictly decreasing order sets a new record.
%C A358101 As A009995 is finite, this sequence is necessarily finite.
%C A358101 Corresponding records are 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, ...
%e A358101 a(9) = 60 is in the sequence because A358099(60) = 10 is larger than any earlier value in A358099.
%t A358101 f[n_] := DivisorSum[n, 1 &, Greater @@ IntegerDigits[#] &]; fm = 0; s = {}; Do[If[(fn = f[n]) > fm, fm = fn; AppendTo[s, n]], {n, 1, 10^6}]; s (* _Amiram Eldar_, Nov 03 2022 *)
%Y A358101 Cf. A009995, A190219, A358099, A358100.
%Y A358101 Similar sequences: A093036, A340548, A357173.
%K A358101 nonn,base,fini
%O A358101 1,2
%A A358101 _Bernard Schott_, Nov 03 2022
%E A358101 More terms from _Amiram Eldar_, Nov 03 2022