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A145756 a(n) = ((2^prime(n+2)-2)/prime(n+2))/3, where n >= 1 0
2, 6, 62, 210, 2570, 9198, 121574, 6170930, 23091222, 1238188770, 17878237850, 68186767614, 998138215286, 56649051916610, 3256840408493918, 12600235023025650, 734198769102867726, 11085367330679918342 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 20 04:37 EDT 2019. Contains 328247 sequences. (Running on oeis4.)