login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A324902 The 2-adic valuation of A318456(n), where A318456(n) = n OR (sigma(n)-n). 3
0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 2, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 2, 0, 1, 0, 2, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 2, 0, 1, 0, 2, 0, 0, 0, 1, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 2, 0, 1, 0, 1, 0, 1, 0, 2, 0, 1, 0, 2, 0, 1, 0, 2, 0, 1, 0, 2, 0, 0, 0, 0, 0, 1, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,12
LINKS
FORMULA
a(n) = A007814(A318456(n)).
a(n) = A324904(n) - A324903(n).
PROG
(PARI)
A318456(n) = bitor(n, sigma(n)-n);
A324902(n) = valuation(A318456(n), 2);
(Python)
from sympy import divisor_sigma
def A324902(n): return (~(m:=n|int(divisor_sigma(n))-n) & m-1).bit_length() # Chai Wah Wu, Jul 01 2022
CROSSREFS
Sequence in context: A060396 A353353 A195470 * A252370 A045827 A070103
KEYWORD
nonn
AUTHOR
Antti Karttunen, Mar 28 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 19 06:19 EDT 2024. Contains 370953 sequences. (Running on oeis4.)