A108130 Partial sums of A108129.

2, 3, 5, 6, 7, 9, 12, 13, 15, 16, 17, 21, 24, 25, 29, 30, 32, 34, 35, 38, 40, 47, 48, 52, 53, 54, 56, 57, 58, 70, 73, 75, 79, 84, 85, 87, 94, 95, 97, 98, 101, 103, 108, 109, 113, 114, 117, 119, 120, 121, 131, 134, 136, 146, 155, 157, 165, 166, 167, 179, 180

Offset

1,1

Links

Table of n, a(n) for n=1..61.

Prog

(PARI) f(n) = my(k=2*n-1, m=1); while(!isprime(k*2^m-1), m++); m; \\ A108129
a(n) = sum(k=1, n, a(k));

Crossrefs

Cf. A108129.

Sequence in context: A082984 A085717 A253083 * A195060 A153763 A345982

Adjacent sequences: A108127 A108128 A108129 * A108131 A108132 A108133

Keyword

nonn

Author

Jorge Coveiro, Jun 04 2005

Extensions

a(14) and following corrected by Georg Fischer, Dec 26 2022

Offset 1 from Michel Marcus, Dec 26 2022

Status

approved