OFFSET
1,2
COMMENTS
LINKS
Jens Kruse Andersen, Table of n, a(n) for n = 1..55
EXAMPLE
Number 24 is in the sequence because 24 divides 2*sigma(24); 24 divides 2*60.
PROG
(Magma) [n: n in [1..1000000] | Denominator(2*(SumOfDivisors(n))/n) eq 1]
(PARI)
for(n=1, 10^8, if((2*sigma(n))%n==0, print1(n, ", "))) \\ Derek Orr, Aug 26 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Aug 26 2014
STATUS
approved