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A088845 Multiply perfect numbers for which the quotient sigma(5,x)/x A001160(x)/x is nonintegral. 3

%I #10 Dec 26 2013 18:52:59

%S 496,523776,23569920,142990848,14942123276641900,20158185857531900,

%T 212517062615532000,275502900594021000,622286506811515000,

%U 2305843008139950000,69357059049509000000,71065075104190100000,87934476737668000000,154345556085771000000

%N Multiply perfect numbers for which the quotient sigma(5,x)/x A001160(x)/x is nonintegral.

%o (PARI) lista() = {v = readvec("b007691.txt"); for (i=1, #v, vi = v[i]; if (sigma(vi, 5) % vi, print1(vi, ", ");););} \\ _Michel Marcus_, Dec 26 2013

%Y Cf. A007691, A001158, A001160, A066269, A088843-A088845.

%K nonn

%O 1,1

%A _Labos Elemer_, Nov 05 2003

%E Extended using A007691 b-file by _Michel Marcus_, Dec 26 2013

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Last modified April 25 11:06 EDT 2024. Contains 371967 sequences. (Running on oeis4.)