OFFSET
1,4
COMMENTS
LINKS
Paul Tek, Table of n, a(n) for n = 1..10000
EXAMPLE
For n = 6; a(n) = sigma(sigma(6)) - sigma(6) - 6 = 28 - 12 - 6 = 10.
CROSSREFS
KEYWORD
sign
AUTHOR
Jaroslav Krizek, Jul 26 2013
STATUS
approved