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If you mean: 53 81 41 47 and 31 then 81 is a composite number while all the rest are prime numbers
The numbers 47 and 53 are prime.
They are: 37, 41, 43, 47 and 53
All of the whole numbers between 50 and 75 are composite numbers, except 53, 59, 61, 67, 71, and 73.
43 47 53.