3,5,7,11,13,15,17,21,23,25,27,29
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All odd numbers are the sum of two consecutive numbers. Odd multiples of 7 less than 25 are 7 and 21.
302
All those not less than 20.
No. Odd numbers can be greater than, smaller than, or equal to prime numbers.
None. All counting numbers are even or odd.