[go: up one dir, main page]
login
The OEIS is supported by the many generous donors to the OEIS Foundation.
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A098204
Greatest common divisor of multiperfect numbers and their totient.
3
1, 2, 4, 8, 16, 96, 64, 864, 72, 1536, 252, 69120, 4096, 86400, 4608, 256, 768, 24576, 65536, 570240, 217728, 691200, 81920, 1105920, 262144, 245760, 516096, 9676800, 26544672, 50181120, 1741824, 2145024, 226437120, 103028889600, 12597120
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..730
FORMULA
a(n) = gcd( A007691(n), A000010(A007691(n)) ).
a(n) = A009195(A007691(n)). - Amiram Eldar, May 10 2024
CROSSREFS
Cf. A000010, A007691, A009195, A098203.
Sequence in context: A233294 A287706 A287705 * A341109 A307635 A323453
Adjacent sequences: A098201 A098202 A098203 * A098205 A098206 A098207
KEYWORD
nonn
AUTHOR
Labos Elemer, Sep 23 2004
EXTENSIONS
More terms from Michel Marcus, Sep 19 2013
STATUS
approved

Lookup Welcome Wiki Register Music Plot 2 Demos Index WebCam Contribute Format Style Sheet Transforms Superseeker Recents
The OEIS Community
Maintained by The OEIS Foundation Inc.
Last modified November 7 17:42 EST 2024. Contains 377536 sequences.
License Agreements, Terms of Use, Privacy Policy