Strange behaviour of prime numbers

[fred_76]

The % I gave are calculated :

% = [Nb of primes ending by n followed by a prime ending by m] / [Nb of primes ending by n in the sample] x 100

What you did is :

% = [Nb of primes ending by n followed by a prime ending by m] / [Nb of primes in the sample] x 100

If I calculate as you for the first million primes (and not primes up to 1 millions), the result is very close to your's (in brackets) :

11 : 4.29% (4.3%)
13 : 7.748% (7.7%)
17 : 7.945% (7.9%)
19 : 5.02% (5.0%)
31 : 5.83% (5.8%)
33 : 3.97% (4.0%)
37 : 7.28% (7.3%)
39 : 7.94% (7.9%)
71 : 6.42% (6.4%)
73 : 6.86% (6.9%)
77 : 3.96% (4.0%)
79 : 7.76% (7.8%)
91 : 8.46% (8.5%)
93 : 6.44% (6.4%)
97 : 5.81% (5.8%)
99 : 4.28% (4.3%)

For the first 10 millions primes, with your method :
11 : 4.47%
13 : 7.56%
17 : 7.70%
19 : 5.27%
31 : 5.93%
33 : 4.22%
37 : 7.15%
39 : 7.70%
71 : 6.39%
73 : 6.82%
77 : 4.22%
79 : 7.57%
91 : 8.20%
93 : 6.40%
97 : 5.93%
99 : 4.46%


Fred