OFFSET
1,2
COMMENTS
a(31) > 10^12. - Donovan Johnson, Mar 01 2012
a(34) > 10^13. - Giovanni Resta, Apr 02 2014
Every number of the form 2^(j-1)*(2^j - 9), where 2^j - 9 is prime, is a term. - Jon E. Schoenfield, Jun 02 2019
LINKS
Jud McCranie, Table of n, a(n) for n = 1..35
MATHEMATICA
Join[{1}, Select[Range[8000000], Mod[DivisorSigma[1, #], #]==8 &]] (* Vincenzo Librandi, Mar 11 2014 *)
PROG
(PARI) is(n)=sigma(n)%n==8 || n==1 \\ Charles R Greathouse IV, Mar 09 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Extended by T. D. Noe, Apr 06 2011
Initial term 1 added and a(26)-a(30) from Donovan Johnson, Mar 01 2012
a(31)-a(33) from Giovanni Resta, Apr 02 2014
STATUS
approved