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Friday Riddle / Teaser - EARLY

nudgie
nudgie CSN Member Posts: 1,478 Member
edited March 2014 in Colorectal Cancer #1
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
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