A145756 a(n) = ((2^prime(n+2)-2)/prime(n+2))/3, where n >= 1

2, 6, 62, 210, 2570, 9198, 121574, 6170930, 23091222, 1238188770, 17878237850, 68186767614, 998138215286, 56649051916610, 3256840408493918, 12600235023025650, 734198769102867726, 11085367330679918342

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Example

For n = 1, a(1) = ((2^prime(1+2)-2)/prime(1+2))/3 = ((2^prime(3)-2)/prime(3))/3 = ((2^5-2)/5)/3 = 30/5/3 = 2

Crossrefs

Equals A064535/3

Sequence in context: A129665 A173606 A134706 * A030170 A082640 A139695

Adjacent sequences: A145753 A145754 A145755 * A145757 A145758 A145759

Keyword

nonn

Author

Vassilis Papadimitriou, Oct 17 2008

Status

approved