OFFSET
1,1
COMMENTS
Or union of {6}, near-perfect numbers m (cf. A181595) for which d(m)=4, and all odd perfect numbers (if they exist). Note that (N\{2})-perfect numbers are numbers for which sigma(m)-2=2m, if m is even, and sigma(m)=2m, if m is odd. They are all even numbers of A045768 and all odd perfect numbers (if they exist).
EXAMPLE
88 is in the sequence since sigma(88) = 180 and 180 - 4 = 2*88.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Vladimir Shevelev, Nov 01 2010, Nov 03 2010
EXTENSIONS
Invalid term removed and a(8)-a(10) from Donovan Johnson, Sep 14 2013
STATUS
approved