(3, 5)
(5, 7)
(11, 13)
(17, 19)
(29, 31)
(41, 43)
(59, 61)
(71, 73)
(101, 103)
(107, 109)
(137, 139)
(149, 151)
(167, 169)
(179, 181)
(191, 193)
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5*3
If you have 30 single socks, you would be able to make 15 pairs. This is because each pair consists of two socks. So, when you divide 30 by 2, you get 15 pairs.
The factors of 15 are 1, 3, 5, 15. There are two factor pairs.
13
5 and 105 and 1510 and 15