All the number except for 35 have only two factors: one and the number itself. 35 is the composite number.
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2, 3, 5, and 9 includes one composite number - 9. 3, 11, 23, and 31 are all prime numbers. 2, 5, 15, and 19 includes one composite number - 19. 7, 17, 29, and 49 includes one composite number - 49.
The first number in that series is 19. That series is part of a larger series that starts with 2.
31 and 61 are prime, the rest composite.
341 is a composite number. Its factors are 1, 11, 31, and 341.
No because 31 is a prime number but 62 is a composite number