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 A352531 #19 Apr 29 2022 22:40:29 %S A352531 3778888999,3778889899,3778889989,3778889998,3778898899,3778898989, %T A352531 3778898998,3778899889,3778899898,3778899988,3778988899,3778988989, %U A352531 3778988998,3778989889,3778989898,3778989988,3778998889,3778998898,3778998988,3778999888,3779888899,3779888989 %N A352531 Numbers with multiplicative persistence value 10. %C A352531 The product of the digits of each term is either 438939648 or 231928233984. %C A352531 The first term that produces the product 231928233984 is a(959230456). %H A352531 Daniel Mondot, <a href="https://oeis.org/wiki/File:Multiplicative_Persistence_Tree.txt">Multiplicative Persistence Tree</a> %e A352531 3778888999 -> 438939648 -> 4478976 -> 338688 -> 27648 -> 2688 -> 768 -> 336 -> 54 -> 20 -> 0. One digit in 10 steps. %Y A352531 Cf. A003001, A014120, A046510-A046518, A352532. %K A352531 nonn,base %O A352531 1,1 %A A352531 _Daniel Mondot_, Mar 19 2022