OFFSET
1,2
COMMENTS
FORMULA
A227758(a(n)) < 0.
EXAMPLE
Number 16 is in sequence because sigma(sigma(16)) - sigma(16) - 16 = 32 - 31 - 16 = -15 < 0.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Jul 29 2013
STATUS
approved