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Out of those 100 numbers, 21 of them are prime numbers, so the remaining (100 - 21) = 79 are composite.
No, only these numbers do: 1, 3, 5, 7, 15, 21, 35, 105.
21, 21, 21, 21 , 15, 1
100
1, 3, 7 and 21. Four numbers.
1 ,3 ,7 ,21
1, 3, 7, 21.
1, 3, 7, 21.
21
The numbers are 18, 19, 20, 21 and 22.
1, 3, 7, 21.
1, 3, 7 and 21