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Apr 10, 2014 at 2:45 comment added John Nicholson See COMMENTS by John W. Nicholson, on Dec 14 2013 at oeis.org/A168421 .
Mar 31, 2014 at 20:03 comment added Terry Tao The asymptotics from the Hardy-Littlewood prime tuple conjecture can be used to predict the number of tuples of the form p, p+2, 2p+1 that are simultaneously prime, and this can lead to a prediction of the precise bias in the probability that 2p+1 is prime if one conditions on the event that p+2 is prime also.
Mar 31, 2014 at 20:01 comment added Terry Tao It's not just mod 6; there is a bias modulo every small prime. For instance, mod 5, a prime p is equal to 1,2,3,4 mod 5, and needs to avoid 2 mod 5 to have any chance to be a Sophie Germain prime (unless it actually is 2). But if p is a twin prime, it avoids 3 mod 5 (if it isn't actually 3), which slightly raises the chance that it is equal to 2 mod 5 instead.
Mar 31, 2014 at 11:50 history edited Stanley Yao Xiao CC BY-SA 3.0
TeX, more standard notation
Mar 31, 2014 at 7:01 comment added Alex Degtyarev What exactly is your numeric evidence?
Mar 31, 2014 at 6:57 review First posts
Mar 31, 2014 at 7:01
Mar 31, 2014 at 6:37 history asked user48949 CC BY-SA 3.0