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

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

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 November 18 19:06 EST 2017. Contains 294894 sequences.