OFFSET
1,1
COMMENTS
a(19) > 10^13. - Giovanni Resta, Apr 02 2014
FORMULA
PROG
(PARI) isok(n) = !(n % 8) && (sigma(n) - 2*n == 8); \\ Michel Marcus, Feb 08 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Shevelev, Nov 01 2010
EXTENSIONS
Definition rephrased by R. J. Mathar, Nov 04 2010
a(16)-a(17) from Donovan Johnson, Dec 08 2011
a(18) from Giovanni Resta, Apr 02 2014
a(19)-a(23) from the b-file at A088833 added by Amiram Eldar, Mar 11 2024
STATUS
approved