OFFSET
1,1
COMMENTS
Mersenne primes are solutions to sigma(n+1)-sigma(n)=n. Conjecture: sequence gives even values only.
Subsequence of A223136. a(9) > 10^13. - Giovanni Resta, Jun 04 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Feb 07 2002
EXTENSIONS
a(4)-a(8) from Donovan Johnson, Feb 01 2009
STATUS
approved