A138901 Partial sums of A094837.

1, 3, 7, 17, 41, 87, 187, 412, 937, 2162, 5298, 12354, 29994, 74094, 182994, 444354, 1081419, 2737788, 6745792, 16765802, 41815827, 105943891, 261683475, 655537299, 1668304275

Offset

1,2

Comments

3, 7, 17, 41, 937 and 105943891 are primes.

Links

Table of n, a(n) for n=1..25.

Example

a(12) = 1 + 2 + 4 + 10 + 24 + 46 + 100 + 225 + 525 + 1225 + 3136 + 7056 = 12354.

Crossrefs

Cf. A094837.

Sequence in context: A167213 A249753 A000600 * A192674 A272480 A131056

Adjacent sequences: A138898 A138899 A138900 * A138902 A138903 A138904

Keyword

nonn

Author

Jonathan Vos Post, May 16 2008

Extensions

a(4)=17 added and a(13)-a(25) from Akshay Bansal, Jul 08 2017

Status

approved