A176074 Partial sums of A006343.

1, 1, 2, 3, 7, 17, 51, 163, 561, 2004, 7391, 27873, 107050, 417152, 1645339, 6555752, 26348334, 106691779, 434851380, 1782551286, 7344326285, 30397197514, 126324028956, 526911437207, 2205163133586, 9256931835831, 38967696710845

Offset

0,3

Comments

Partial sums of Arkons: number of elementary maps with n-1 nodes. The subsequence of primes in the partial sum begins: 2, 3, 7, 17, 163, no more through a(26).

Links

Table of n, a(n) for n=0..26.

Formula

a(n) = SUM[i=0..n] A006343(i) = SUM[i=0..n].

Example

a(7) = 1 + 0 + 1 + 1 + 4 + 10 + 34 + 112 = 163 is prime.

Crossrefs

Cf. A006343, A000934.

Sequence in context: A274291 A358456 A208987 * A281368 A330726 A059801

Adjacent sequences: A176071 A176072 A176073 * A176075 A176076 A176077

Keyword

easy,nonn

Author

Jonathan Vos Post, Apr 07 2010

Status

approved