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!)
A104415 Number of prime factors, with multiplicity, of the nonzero octanacci numbers A079262. 2
0, 0, 1, 2, 3, 4, 5, 6, 7, 3, 1, 4, 5, 6, 6, 11, 7, 9, 1, 4, 3, 6, 8, 7, 8, 11, 10, 2, 2, 8, 4, 9, 7, 11, 11, 12, 3, 2, 4, 5, 6, 9, 10, 11, 12, 2, 4, 10, 5, 10, 9, 17, 12, 10, 4, 4, 4, 9, 11, 8, 8, 12, 12, 4, 4, 10, 11, 9, 11, 15, 13, 9, 5, 6, 5, 9, 6, 9, 9 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..262

FORMULA

a(n) = A001222(A079262(n+6)).

EXAMPLE

a(0)=a(1)=0 because the first two nonzero octanacci numbers are both 1, which has zero prime divisors.

a(2)=1 because the 3rd nonzero octanacci number is 2, a prime, with only one prime divisor.

a(3)=2 because the 4th nonzero octanacci number is 4 = 2^2 which has (with multiplicity) 2 prime divisors (which happen to be equal).

a(4)=3 because the 5th nonzero octanacci number is 8 = 2^3.

a(10)=3 because A079262(10) = 255 = 3 * 5 * 17 which has 3 prime factors.

CROSSREFS

Cf. A001222, A079262, A104411, A104412, A104413, A104414.

Sequence in context: A091733 A066990 A097449 * A071074 A279648 A066323

Adjacent sequences:  A104412 A104413 A104414 * A104416 A104417 A104418

KEYWORD

easy,nonn

AUTHOR

Jonathan Vos Post, Mar 06 2005

EXTENSIONS

Offset corrected and more terms added by Amiram Eldar, Sep 08 2019

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 April 16 12:45 EDT 2021. Contains 343037 sequences. (Running on oeis4.)