login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A166722 a(n) is the number of divisors of A166721(n). 2
1, 3, 5, 9, 7, 15, 21, 27, 11, 25, 45, 13, 35, 33, 63, 75, 39, 81, 49, 17, 55, 105, 135, 99, 19, 65, 51, 189, 77, 125, 117, 147, 225, 165, 57, 243, 91, 175, 23, 85, 315, 195, 297, 153, 231, 95, 405, 245, 69, 375, 351, 119, 275, 441, 171, 121, 273, 567, 495, 255, 525 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This is a permutation of the odd numbers A005408. - Alois P. Heinz, Mar 04 2018

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..300

EXAMPLE

a(8) = A000005(A166721(8)) = A000005(900) = A000005(2^2 * 3^2 * 5^2) = (2+1)*(2+1)*(2+1) = 27.

CROSSREFS

Cf. A000005, A005408, A048691, A136404, A152674, A166721.

Sequence in context: A003961 A332818 A100463 * A094549 A029642 A221967

Adjacent sequences:  A166719 A166720 A166721 * A166723 A166724 A166725

KEYWORD

easy,nonn

AUTHOR

Alexander Isaev (i2357(AT)mail.ru), Oct 20 2009

EXTENSIONS

Proper definition (and removal of obscure Comments entries) by Jon E. Schoenfield, Mar 03 2018

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 8 01:41 EST 2021. Contains 341934 sequences. (Running on oeis4.)