challenge - prime numbers where sum of squared digits of prime number is also prime

[Didier Lachieze]

(01-05-2018 04:38 PM)Mike (Stgt) Wrote:  

(01-05-2018 01:34 PM)Gene Wrote:  How many primes less than 1000 is this true for?

49

Interesting, my program above returns 53 prime numbers below 1000, from 11 to 997:

{11,23,41,61,83,101,113,131,137,173,179,191,197,199,223,229,311,313,317,331,337,​353,373,379,397,401,409,443,449,461,463,467,601,641,643,647,661,683,719,733,739,​773,797,829,863,883,911,919,937,971,977,991,997}