A067803 Numbers n such that sigma(n)-sigma(n+1)=n.

532, 954, 104944, 918080, 10368512, 25316030960, 35053995440, 45883878740

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

Links

Table of n, a(n) for n=1..8.

Crossrefs

Cf. A223136.

Sequence in context: A191950 A333102 A048055 * A098258 A160176 A077085

Adjacent sequences: A067800 A067801 A067802 * A067804 A067805 A067806

Keyword

nonn

Author

Benoit Cloitre, Feb 07 2002

Extensions

a(4)-a(8) from Donovan Johnson, Feb 01 2009

Status

approved