OFFSET
1
COMMENTS
No value of n is known such that a(n) = -1.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
J. Alanen, O. Ore and J. Stemple, Systematic computations on amicable numbers, Math. Comp., Vol. 21, No. 98 (1967), pp. 242-245.
Wikipedia, Amicable numbers.
CROSSREFS
KEYWORD
nonn
AUTHOR
Felix Fröhlich, Dec 15 2015
STATUS
approved