Both are prime numbers and a Prime number is only divisible by 1 and itself.
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1, 7, 13, 91.
1, 3, 7, 13, 21, 39, 91, 273.
from 7 to 19 the prime numbers are 11, 13, and 17
42 and 49 6*7 = 42 7*7 = 49 6+7 =13
7 11 13 17 19.