I'm wondering, is there a name for a prime number where all digits are also prime?
Some examples: 37, 53, 3253, 5573, 23753.
I've been calling them 'double primes', but I doubt that's the correct term (if there is any).
I'm wondering, is there a name for a prime number where all digits are also prime?
Some examples: 37, 53, 3253, 5573, 23753.
I've been calling them 'double primes', but I doubt that's the correct term (if there is any).
From GEdgar so we have an answer:
Why not call them "prime numbers with only prime digits"?
Chris Caldwell in his Prime Pages calls them "prime-digit primes."