A098204 Greatest common divisor of multiperfect numbers and their totient.

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

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