OFFSET
1,1
COMMENTS
See also comments in A053474.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
EXAMPLE
The 13th non-sigma number is 26. Its divisors are {26,13,2,1} of which the sum is 42. So a(13) = 42.
Also a(20) = 42, the divisor sum of 20th term in A007369, which is 41.
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jan 17 2000
STATUS
approved