It is 1 which has only one factor followd by any of the prime numbers which have only two factors
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1 has the fewest factors.
1 has only one factor - itself.
1
The least prime factors of j are 2 x 3 x 5, so j has to be equal to 30 or more. 30 has 8 factors: 1, 2, 3, 5, 6, 10, 15, and 30.
They are: 1 2 3 5 7 11 13 17 19 and 23 which are all prime numbers having only 2 factors except for 1 which has only one factor which is itself.