The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A285904 Partial row products of table A027746, prime factors with repetition, reversed. 1

%I #9 May 03 2017 21:57:04

%S 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 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 29,5,15,30,31,2,4,8,16,32,11,33,17,34,7,35,3,9,18,36,37

%N Partial row products of table A027746, prime factors with repetition, reversed.

%C T(n,1) = A006530(n); T(n,A001222(n)) = n.

%H Michael De Vlieger, <a href="/A285904/b285904.txt">Table of n, a(n) for n = 1..15568</a> (rows 1 <= n <= 5000).

%e . n | T(n,*) | A027746(n,*)

%e . ----+----------------+----------------

%e . 1 | 1 | 1

%e . 2 | 2 | 2

%e . 3 | 3 | 3

%e . 4 | 2, 4 | 2, 2

%e . 5 | 5 | 5

%e . 6 | 3, 6 | 2, 3

%e . 7 | 7 | 7

%e . 8 | 2, 4, 8 | 2, 2, 2

%e . 9 | 3, 9 | 3, 3

%e . 10 | 5, 10 | 2, 5

%e . 11 | 11 | 11

%e . 12 | 3, 6, 12 | 2, 2, 3

%e . 13 | 13 | 13

%e . 14 | 7, 14 | 2, 7

%e . 15 | 5, 15 | 3, 5

%e . 16 | 2, 4, 8, 16 | 2, 2, 2, 2

%e . 17 | 17 | 17

%e . 18 | 3, 9, 18 | 2, 3, 3

%e . 19 | 19 | 19

%e . 20 | 5, 10, 20 | 2, 2, 5

%t Table[FoldList[Times, Reverse@ Flatten[FactorInteger[n] /. {p_, e_} /; e > 0 :> ConstantArray[p, e]]], {n, 37}] // Flatten (* _Michael De Vlieger_, Apr 28 2017 *)

%Y Cf. A001222, A006530, A027746, A265110.

%K nonn,easy,tabf

%O 1,2

%A _Michael De Vlieger_, Apr 28 2017

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 6 00:30 EDT 2024. Contains 373110 sequences. (Running on oeis4.)