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 A319507 #11 Jun 30 2020 07:06:23 %S A319507 1,2,36,3489,24778899,566677899999,47777778999999999999 %N A319507 Smallest number of multiplicative-additive divisors persistence n. %C A319507 To compute the "multiplicative-additive divisors persistence" of a number, we proceed as follows. Form the product of the digits of the number (A007954) divided by the sum of the digits (A007953). Repeat this process until you reach 0 or 1. If we reach a non-integer, we write 0. The "multiplicative-additive divisors persistence" is the number of steps to reach 0 or 1. %C A319507 For instance: the multiplicative-additive divisors persistence of 874 is 1, because 874 -> 8 * 7 * 4 / (8 + 7 + 4) = 224/19. This is not an integer, so the process stops after one step. %e A319507 The multiplicative additive divisors persistence of 24778899 is 4: 24778899 -> (2032128/54=) 37632 -> (756/21=) 36 -> (18/9=) 2 -> (2/2=) 1. %Y A319507 Cf. A038367, A126789, A003001, A006050, A007953, A007954, A031346. %K A319507 nonn,base,more %O A319507 0,2 %A A319507 _Pieter Post_, Sep 21 2018 %E A319507 Offset set to 0. - _R. J. Mathar_, Jun 30 2020