A097908 Decimal expansion of Sum_{i >= 1} f(i)/g(i), where f(i) = triangular number(i) and g(i) = (sum of first i primes)^3.

1, 5, 8, 3, 6, 8, 8, 8, 3, 4, 7, 3, 7, 0, 8, 5, 1, 0, 8, 5, 1, 7, 9, 6, 1, 5, 4, 6, 8, 0, 3, 8

Offset

0,2

Links

Table of n, a(n) for n=0..31.

Formula

Equals Sum_{n>=1} A000217(n)/A007504(n)^3. - R. J. Mathar, Dec 07 2014

Example

0.1583688834737085...

Crossrefs

Cf. A000217, A007504.

Sequence in context: A196567 A200685 A099872 * A198612 A019907 A248007

Adjacent sequences: A097905 A097906 A097907 * A097909 A097910 A097911

Keyword

nonn,cons,more

Author

Pierre CAMI, Sep 04 2004

Extensions

Offset corrected by and a(14)-a(19) from R. J. Mathar, Jan 31 2009

a(20)-a(31) from Jinyuan Wang, Jul 02 2022

Status

approved