login
A067806
Numbers n such that sigma(n+1)+sigma(n)=3n.
3
10, 34, 136, 169, 2402, 5329, 21004, 41164, 54722, 1060802, 5026562, 10800112, 11108164, 14366402, 87026656, 102944992, 10499710072, 107000850688, 220200311872, 924354816004
OFFSET
1,1
COMMENTS
a(21) > 10^13. - Giovanni Resta, Jul 11 2013
MATHEMATICA
For[n=1, True, n++, If[DivisorSigma[1, n]+DivisorSigma[1, n+1]==3n, Print[n]]]
CROSSREFS
Sequence in context: A166066 A232583 A068078 * A001446 A264671 A341300
KEYWORD
more,nonn
AUTHOR
Benoit Cloitre, Feb 07 2002
EXTENSIONS
Edited by Dean Hickerson, Feb 16 2002
a(17) from Donovan Johnson, Jan 31 2009
a(18)-a(20) from Giovanni Resta, Jul 11 2013
STATUS
approved