Friday Riddle / Teaser - ANSWER

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


ANSWER: The numbers are grouped by column according to their BINGO letters (B=1 through 15, I = 16 through 30, N = 31 through 45, G = 46 through 60, O = 61 through 75)