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 A343160 #14 Apr 14 2021 20:05:11 %S A343160 0,1,2,3,4,5,6,7,8,9,10,12,14,16,18,15,21,24,27,20,28,32,36,25,30,35, %T A343160 40,45,42,48,54,49,56,63,64,72,81,50,60,70,80,90,84,96,108,98,112,126, %U A343160 128,144,162,75,105,120,135,147,168,189,192,216,243,100,140 %N A343160 a(n) is the product of the decimal digits of A343403(n). %C A343160 Each 7-smooth number (A002473) appears exactly once in the sequence. %H A343160 Rémy Sigrist, <a href="/A343160/b343160.txt">Table of n, a(n) for n = 1..10000</a> %H A343160 Rémy Sigrist, <a href="/A343160/a343160.gp.txt">PARI program for A343160</a> %F A343160 a(n) = A007954(A343403(n)). %e A343160 For n = 42: %e A343160 - A343403(42) = 259, %e A343160 - so a(42) = 2*5*9 = 90. %o A343160 (PARI) See Links section. %Y A343160 Cf. A002473, A007954, A343403. %K A343160 nonn,base %O A343160 1,3 %A A343160 _Rémy Sigrist_, Apr 14 2021