They are 15*4 = 60 and 15+4 = 19
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The sum of the first 60 positive integers is 1830.
No. 12 is.16 isn't even a factor of 60.
The prime factor of 19 = 19. The prime factors of 76 = 2 x 2 x 19 They have the prime factor 19 in common, so 19 is the GCF of 19 and 76.
4, 12, 20, 60