A131425 Row sums of triangle A131424.

1, 5, 16, 33, 68, 101, 156, 205, 280, 389, 468, 605, 732, 841, 988, 1181, 1392, 1545, 1784, 1999, 2182, 2463, 2714, 3027, 3410, 3709, 3964, 4283, 4554, 4893, 5564, 5947, 6410, 6751, 7386, 7755, 8282, 8827, 9310, 9887, 10482, 10923, 11722, 12191, 12758, 13243

Offset: 1

Author

Gary W. Adamson, Jul 10 2007

Keywords

• nonn

Examples

			a(4) = 33 = sum of row 4 terms of triangle A131424: (6 + 7 + 9 + 11).
		

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A131424, A131426, A127640, A000040.

Programs

Mathematica

Table[n (Prime[n]-3)+Sum[Prime[k],{k,n}],{n,50}] (* Harvey P. Dale, Nov 28 2024 *)

PARI

a(n)={n*(prime(n) - 3) + sum(k=1, n, prime(k))} \\ Andrew Howroyd, Aug 28 2018

Formula

a(n) = n*(prime(n) - 3) + Sum_{k=1..n} prime(k). - Andrew Howroyd, Aug 28 2018

Extensions

Terms a(10) and beyond from Andrew Howroyd, Aug 28 2018