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 A232487 #15 Jul 07 2020 13:44:31 %S A232487 5,10,11,12,14,18,26,38,62,74,102,104,108,116,122,126,138,162,174,202, %T A232487 206,218,234,258,338,410,414,430,442,474,586,826,922,958,1318,1342, %U A232487 1366,1474,1586,1826,1922,1958,2318,2366,2582,2742,2854,3174,3258,3498,4362 %N A232487 a(1) = 5; a(n+1) = a(n) + product of nonzero digits of a(n). %H A232487 Harvey P. Dale, <a href="/A232487/b232487.txt">Table of n, a(n) for n = 1..1000</a> %H A232487 P. A. Loomis, <a href="http://facstaff.bloomu.edu/ploomis/itseq4.ps">An Introduction to Digit Product Sequences</a>, J. Rec. Math., 32 (2003-2004), 147-151. %H A232487 P. A. Loomis, <a href="/A063108/a063108.pdf">An Introduction to Digit Product Sequences</a>, J. Rec. Math., 32 (2003-2004), 147-151. [Annotated archived copy] %H A232487 <a href="/index/Coi#Colombian">Index entries for Colombian or self numbers and related sequences</a> %p A232487 See A232486. %t A232487 NestList[#+Times@@Select[IntegerDigits[#],#>0&]&,5,50] (* _Harvey P. Dale_, Jul 07 2020 *) %Y A232487 Cf. A063108, A232486, A232488. %K A232487 nonn,base %O A232487 1,1 %A A232487 _N. J. A. Sloane_, Nov 29 2013