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Whatever size it happens to be, they are all different.
53-13 = 40
13
4.0769
4.0769
13 + 53 = 66
53 - 13, D20
The only factors of 53 are 1 and 53. That's what makes it prime.
13 +40 = 53.
13 and 53 share no common factors aside from 1.
689
1, 2, 13, 26, 53, 106, 689, 1378 2, 13 and 53 are prime.