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

Author

Labos Elemer, Sep 23 2004

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..730

Crossrefs

Cf. A000010, A007691, A009195, A098203.

Formula

a(n) = gcd( A007691(n), A000010(A007691(n)) ).

a(n) = A009195(A007691(n)). - Amiram Eldar, May 10 2024

Extensions

More terms from Michel Marcus, Sep 19 2013