A380276 - OEIS

A380276

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

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

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OFFSET

0,1

COMMENTS

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

LINKS

FORMULA

Equals (A342714^2-A356793)/2.

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

EXAMPLE

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

CROSSREFS

KEYWORD

nonn,cons,hard,more

AUTHOR

STATUS

approved