What is the ratio of primes n converging with 2n+1 to prime ?

From: "Roman B. Binder" <rbinder@xxxxxxxxxxxxxxxx>
Date: Wed, 24 Sep 2008 16:39:17 EDT

Hi,
I just wonder how it will happen with growing
value of n prime. Does 2n+1 always will have
a chance to be prime ?
For smallest primes from 2 to 101 the ratio is
next to 0.5 (exactly 14/29) :

Regards

Ro-Bin
.

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