0.8723404255319148936...

This number is neither prime nor composite.

                                         0. 8723404255 3191489361 7021276595
7446808510 6382978723 4042553191 4893617021 2765957446 8085106382 9787234043

41/47 = R(5)/p(15) is the maximum of R(n)/p(3n), where R(n) is the n-th Ramanujan prime, and p(n) is the n-th prime. [Post]