1.347069552...

This number is neither prime nor composite.

Just showing those entries submitted by 'Xavier': (Click here to show all)

The sum of the reciprocals of the twin primes separated by non-squarefree numbers: (1/3 + 1/5) + (1/11 + 1/13) + (1/17 + 1/19) + (1/59 + 1/61) + ... . [Xavier]