A380276 Decimal expansion of infinite sum of reciprocals Sum_{n>=1} 1/A357934(n).

4, 7, 7, 9, 9, 9, 3

Offset: 0

Author

Artur Jasinski, Jan 18 2025

Keywords

• nonn
• cons
• hard
• more

Comments

Sum of reciprocals of product of two distinct lesser twin primes.

Examples

			0.47799932... = 1/15 + 1/33 + 1/51 + 1/55 + 1/85 + 1/87 + ...
		

Crossrefs

Cf. A001359, A342714, A356793, A357934.

Cf. A209328.

Formula

Equals (A342714^2-A356793)/2.

Equals Sum_{m=2} 1/(A001359(m)*A001359(n)).