OFFSET
0,2
COMMENTS
This constant is A275647 (which gives the sum of the reciprocals of the squares of nonprime numbers) minus 1.
FORMULA
Equals Sum_{k>=1} 1/A002808(k)^2.
EXAMPLE
Equals 1/4^2 + 1/6^2 + 1/8^2 + 1/9^2 + 1/10^2 + ... = 0.19268664680716093796587180181377725504571855796690...
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Jon E. Schoenfield, Jan 26 2021
STATUS
approved