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!)
A339812 Number of prime divisors of (A019565(n) - 1), counted with multiplicity. 5
0, 1, 1, 2, 2, 2, 1, 2, 1, 3, 1, 2, 2, 4, 2, 2, 2, 5, 2, 4, 1, 3, 2, 3, 3, 3, 1, 8, 1, 2, 1, 3, 2, 2, 2, 6, 2, 2, 1, 4, 1, 5, 2, 2, 3, 4, 1, 2, 3, 3, 1, 4, 1, 6, 1, 6, 3, 3, 2, 5, 1, 2, 1, 4, 2, 3, 1, 4, 2, 2, 1, 2, 2, 3, 2, 5, 2, 4, 2, 3, 1, 6, 2, 2, 3, 3, 2, 4, 1, 3, 1, 5, 2, 2, 2, 4, 4, 2, 3, 6, 2, 2, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

FORMULA

a(n) = A001222(A339809(n)) = A001222(A019565(n)-1).

a(n) = A001222(A339810(n)).

PROG

(PARI)

A019565(n) = { my(m=1, p=1); while(n>0, p = nextprime(1+p); if(n%2, m *= p); n >>= 1); (m); };

A339812(n) = bigomega(A019565(n)-1);

CROSSREFS

Cf. A001222, A019565, A339809, A339810.

Sequence in context: A022307 A029413 A237523 * A238568 A238421 A105154

Adjacent sequences:  A339809 A339810 A339811 * A339813 A339814 A339815

KEYWORD

nonn

AUTHOR

Antti Karttunen, Dec 18 2020

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 June 15 08:52 EDT 2021. Contains 345048 sequences. (Running on oeis4.)