OFFSET
0,1
COMMENTS
Infinite sum of the reciprocals of p, p+2, p+6, and p+8, where p ranges over all elements of A007530.
The 9th digit is probably 0.
LINKS
Thomas R. Nicely, Enumeration to 1.6e15 of the prime quadruplets.
Wikipedia, Brun's theorem.
Wikipedia, Prime quadruplet.
FORMULA
Sum_{n >= 1} (1/c(n) + 1/(c(n)+2) + 1/(c(n)+6) + 1/(c(n)+8)), where c(n) = A007530(n).
EXAMPLE
0.8705883800[+-5]
CROSSREFS
KEYWORD
AUTHOR
Stanislav Sykora, Jun 01 2012
STATUS
approved