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This is the prime numbers: O = 1 T = 3 F = 5 S = 7 E = 11 T = 13 S = 17 One has been included although not being prime. Two has been left out although prime. The next prime number after 17 is 19, and so the next letter would be N.
It looks as if every third letter is an "r"; the remaining letters are in sequence.
Assuming that you want the numbers that contain the letter 'o' the answer is 22.