For a safe prime q = 2p + 1, the number q − 1 naturally has a large prime factor, namely p, and so a safe prime q meets part of the criteria for being a strong prime.
For et sikker primtal 'q' = 2'p' + 1, har tallet 'q' - 1 naturligvis en stor primtalsfaktor, nemlig 'p', og så opfylder det sikre primtal 'q' en del af kriterierne for at være en stærk primtal.