Information as of 2020-04-07: Inserting more history entries for Riesel primes k<300

# Sophie Germain prime

A prime number p is called a Sophie Germain prime if 2p + 1 is also prime. For example, 23 is a Sophie Germain prime because it is a prime and 2*23+1 = 47, also prime.

It is not known whether there are infinitely many Sophie Germain primes.

## List of Sophie Germain primes

The next table includes the first 500 Sophie Germain primes.

## Table

ToDo: List of primes as document

This is only a test.

1 2 -
2 3 Mersenne 22-1
3 5 Riesel 3•21-1
4 11 Riesel 3•22-1
5 23 Riesel 3•23-1
6 29 Riesel 15•21-1
7 41 Riesel 21•21-1
8 53 Riesel 27•21-1
9 83 Riesel 21•22-1
10 89 Riesel 45•21-1
11 113 Riesel 57•21-1
12 131 Riesel 33•22-1
13 173 Riesel 87•21-1
14 179 Riesel 45•22-1
15 191 Riesel 3•26-1
16 233 Riesel 117•21-1
17 239 Riesel 15•24-1
18 251 Riesel 63•22-1
19 281 Riesel 141•21-1
20 293 Riesel 147•21-1
212 11519 Riesel 45•28-1
100000 19391363 Riesel 4847841•22-1
145135534866431 Riesel 33•242-1
Note: Possible to give the No. (if available) in the comments of the Riesel prime page (see Template NVal)?