8, 13, 21, 32, 47, 63, 83 Justify each of the above numbers as a qualifying answer for "Odd man out" puzzle.
Rem 1: Partial answers accepted.
Rem 2: Will comment later how this puzzle was born.
8 = the only single digit #
13 = the smallest prime in the given sequence
21 = the only non-prime with precisely 3 factors: 1, 3, 7
32 = median # of the given sequence
47 = the largest prime less than 50
63 = the only non-prime with precisely 4 factors: 1, 3, 7, 9
83 = the largest prime in the given sequence
The possibilities are endless!