Friday Riddle / Teaser - EARLY

nudgie

I will be unplugged until Monday, so I am posting early:

The numbers 2 and 5 are the only two prime numbers that end 2 or 5. What is the rationale for the following group of numbers:

3 17 31 47 61
7 19 37 49 67
11 23 41 53 71
13 29 43 59 73

PGLGreg

Assuming that 7 times 7 is 48, they are the rest of the lowest 22 primes.