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A067803 Numbers n such that sigma(n)-sigma(n+1)=n. 2
532, 954, 104944, 918080, 10368512, 25316030960, 35053995440, 45883878740 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 27 06:54 EDT 2021. Contains 347673 sequences. (Running on oeis4.)