A077131 Sum of odd-indexed primes.

2, 7, 18, 35, 58, 89, 130, 177, 236, 303, 376, 459, 556, 659, 768, 895, 1032, 1181, 1338, 1505, 1684, 1875, 2072, 2283, 2510, 2743, 2984, 3241, 3510, 3787, 4070, 4377, 4690, 5021, 5368, 5721, 6088, 6467, 6856, 7257, 7676, 8107, 8546, 8995, 9456, 9923, 10410

Offset

1,1

Comments

Partial sums of A031368. - Michel Marcus, Oct 27 2015

Links

Paolo Xausa, Table of n, a(n) for n = 1..10000

Example

p_1=2, p_2=3 and p_3=5, therefore a(2) = p_1 + p_3 = 2 + 5 = 7.

Mathematica

A077131list[nmax_]:=Accumulate[Prime[Range[1, 2nmax, 2]]]; A077131list[100] (* Paolo Xausa, Aug 28 2023 *)
Accumulate[Prime[Range[1, 101, 2]]] (* Harvey P. Dale, Nov 08 2024 *)

Prog

(PARI) a(n)=if(n<1, 0, sum(k=1, n, prime(2*k-1)))

Crossrefs

Cf. A031368, A077126.

Sequence in context: A307684 A141631 A172188 * A342397 A212685 A176854

Adjacent sequences: A077128 A077129 A077130 * A077132 A077133 A077134

Keyword

nonn

Author

Jon Perry, Nov 29 2002

Status

approved