They are prime numbers, divisible only by one and themselves.
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How many subsets are there in 2 3 5 7 11 13 17 19 23?
They are consecutive prime numbers 2 3 5 7 11 13 17 19 23 29 31 ..... etc
2 3 5 7 11 13 17 19 23 29 31 They are prime numbers.
5/6 of 13/5 = 5/6 of 8/5 = 8/6 = 4/3 or 11/3
13