A067795 Numbers n such that 2*n+1 is the next prime after sigma(n).

2, 6, 8, 14, 44, 128, 315, 2144, 32768, 55328384, 815634435

Offset

1,1

Comments

a(12) > 3*10^10. - Donovan Johnson, May 16 2011

Links

Table of n, a(n) for n=1..11.

Crossrefs

Sequence in context: A199697 A339976 A135619 * A212353 A029933 A228366

Adjacent sequences: A067792 A067793 A067794 * A067796 A067797 A067798

Keyword

nonn,more

Author

Benoit Cloitre, Feb 07 2002

Extensions

Added missing term 2 and a(10)-a(11) from Donovan Johnson, May 16 2011

Status

approved