login
This site is supported by donations to The OEIS Foundation.

 

Logo

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A122811 Number of prime factors (counted with multiplicity) of the smallest odd number with exactly n divisors. 3
0, 1, 2, 2, 4, 3, 6, 3, 4, 5, 10, 4, 12, 7, 6, 5, 16, 5, 18, 6, 8, 11, 22, 5, 8, 13, 6, 8, 28, 7, 30, 6, 12, 17, 10, 6, 36, 19, 14, 7, 40, 9, 42, 12, 8, 23, 46, 6, 12, 9, 18, 14, 52, 7, 14, 9, 20, 29, 58, 8, 60, 31, 10, 7, 16, 13, 66, 18, 24, 11, 70, 7, 72, 37, 10, 20, 16, 15, 78, 8, 8, 41 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(p) = p-1 for prime p.

This sequence first differs from A059975(n) at n=16, because 3^3.5.7 is less than 3.5.7.11. - Hugo van der Sanden, May 21 2010

LINKS

Table of n, a(n) for n=1..82.

FORMULA

a(n) = Omega(A038547(n)), where Omega(n) = A001222(n).

CROSSREFS

Cf. A001222, A038547, A122376, A059975.

Sequence in context: A156864 A059975 A087656 * A089173 A126090 A058266

Adjacent sequences:  A122808 A122809 A122810 * A122812 A122813 A122814

KEYWORD

nonn

AUTHOR

Ray Chandler, Sep 22 2006

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified August 18 23:43 EDT 2017. Contains 290782 sequences.