Posted by anonymous1 on .
Two consecutive odd primes, such as 11 and 13, are called a pair of "twin primes" how many pairs of twin primes are there between 15 and 45?
F2
G3
H4
J5
K7

math 
drwls,
Make a list of odd consecutive pairs. It cannot include 15, 21, 25, 27, 33, 35, 39, or 45.
17  19
29  31
41  43
A total of three
I can't think of any others. Can you?