OFFSET
1,2
COMMENTS
a(5)-a(8) were taken from the paper by Pomerance and Yang.
a(9)-a(10) were taken from the paper Pollack and Pomerance.
LINKS
Carl Pomerance and Hee-Sung Yang, Variant of a theorem of Erdős on the sum-of-proper-divisors function, Mathematics of Computation, Vol. 83, No. 288 (2014), pp. 1903-1913.
Paul Pollack and Carl Pomerance, Some problems of Erdős on the sum-of-divisors function, Transactions of the American Mathematical Society, Series B Vol. 3, No. 1 (2016), pp. 1-26.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Amiram Eldar, Jul 24 2017
STATUS
approved