If you are wanting to add odd numbers to get 399, it won't work.
If you are wanting to multiply to get 399, it is 19 x 21.
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Consecutive whole numbers will have an odd sum. Consecutive odd numbers, or consecutive prime numbers, will be 29 and 31.
the sum of first 50 consecutive odd numbers is 9801
The sum of the first 600 consecutive odd numbers is 360,000.
The sum of the first 60 consecutive odd numbers is 3,600.
The sum of the first 60 consecutive odd numbers is 3,600.