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 A285904 #9 May 03 2017 21:57:04 %S A285904 1,2,3,2,4,5,3,6,7,2,4,8,3,9,5,10,11,3,6,12,13,7,14,5,15,2,4,8,16,17, %T A285904 3,9,18,19,5,10,20,7,21,11,22,23,3,6,12,24,5,25,13,26,3,9,27,7,14,28, %U A285904 29,5,15,30,31,2,4,8,16,32,11,33,17,34,7,35,3,9,18,36,37 %N A285904 Partial row products of table A027746, prime factors with repetition, reversed. %C A285904 T(n,1) = A006530(n); T(n,A001222(n)) = n. %H A285904 Michael De Vlieger, <a href="/A285904/b285904.txt">Table of n, a(n) for n = 1..15568</a> (rows 1 <= n <= 5000). %e A285904 . n | T(n,*) | A027746(n,*) %e A285904 . ----+----------------+---------------- %e A285904 . 1 | 1 | 1 %e A285904 . 2 | 2 | 2 %e A285904 . 3 | 3 | 3 %e A285904 . 4 | 2, 4 | 2, 2 %e A285904 . 5 | 5 | 5 %e A285904 . 6 | 3, 6 | 2, 3 %e A285904 . 7 | 7 | 7 %e A285904 . 8 | 2, 4, 8 | 2, 2, 2 %e A285904 . 9 | 3, 9 | 3, 3 %e A285904 . 10 | 5, 10 | 2, 5 %e A285904 . 11 | 11 | 11 %e A285904 . 12 | 3, 6, 12 | 2, 2, 3 %e A285904 . 13 | 13 | 13 %e A285904 . 14 | 7, 14 | 2, 7 %e A285904 . 15 | 5, 15 | 3, 5 %e A285904 . 16 | 2, 4, 8, 16 | 2, 2, 2, 2 %e A285904 . 17 | 17 | 17 %e A285904 . 18 | 3, 9, 18 | 2, 3, 3 %e A285904 . 19 | 19 | 19 %e A285904 . 20 | 5, 10, 20 | 2, 2, 5 %t A285904 Table[FoldList[Times, Reverse@ Flatten[FactorInteger[n] /. {p_, e_} /; e > 0 :> ConstantArray[p, e]]], {n, 37}] // Flatten (* _Michael De Vlieger_, Apr 28 2017 *) %Y A285904 Cf. A001222, A006530, A027746, A265110. %K A285904 nonn,easy,tabf %O A285904 1,2 %A A285904 _Michael De Vlieger_, Apr 28 2017