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Greatest common divisor of multiperfect numbers and their totient.
3

%I #13 May 10 2024 03:37:08

%S 1,2,4,8,16,96,64,864,72,1536,252,69120,4096,86400,4608,256,768,24576,

%T 65536,570240,217728,691200,81920,1105920,262144,245760,516096,

%U 9676800,26544672,50181120,1741824,2145024,226437120,103028889600,12597120

%N Greatest common divisor of multiperfect numbers and their totient.

%H Amiram Eldar, <a href="/A098204/b098204.txt">Table of n, a(n) for n = 1..730</a>

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

%F a(n) = A009195(A007691(n)). - _Amiram Eldar_, May 10 2024

%Y Cf. A000010, A007691, A009195, A098203.

%K nonn

%O 1,2

%A _Labos Elemer_, Sep 23 2004

%E More terms from _Michel Marcus_, Sep 19 2013