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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A105255 Number of distinct prime divisors of 88...889 (with n 8s). 0
1, 1, 2, 2, 2, 2, 2, 2, 5, 3, 2, 5, 3, 1, 6, 4, 1, 4, 4, 3, 4, 4, 2, 3, 3, 3, 4, 4, 2, 6, 5, 4, 6, 3, 1, 5, 6, 2, 6, 4, 3, 7, 5, 2, 8, 7, 4, 7, 5, 4, 7, 3, 7, 5, 3, 3, 9, 6, 5, 3, 3, 3, 7, 3, 4, 6, 4, 2, 6, 7, 5, 7, 7, 4, 7, 6, 4, 5, 3, 4, 6, 2, 2, 7, 5, 3, 9, 6, 4, 8, 6, 7, 5, 2, 5, 6, 5, 5, 7, 7 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

EXAMPLE

The number of distinct prime divisors of 89 is 1 (prime).

The number of distinct prime divisors of 889 is 2.

The number of distinct prime divisors of 8889 is 2.

CROSSREFS

Cf. A104543.

Sequence in context: A100825 A202709 A008767 * A140818 A139813 A172009

Adjacent sequences:  A105252 A105253 A105254 * A105256 A105257 A105258

KEYWORD

nonn,base

AUTHOR

Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Apr 29 2005

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 17 14:50 EST 2012. Contains 206050 sequences.