Answer to Puzzle Contest (from the winner):

"16 does not belong. The other numbers follow the form x = y to the y power.

x = y to the y power

1 = 1
4 = 2 x 2
27 = 3 x 3 x 3
256 = 4 x 4 x 4 x 4
3125 = 5 x 5 x 5 x 5 x 5"

Winner: Paul Riemer, Tonawanda, NY

Contest Statistics: Newsletter sent to 288597 subscribers, 35 answers submitted, 26 answers correct, 74.29% accuracy. Chance of a correct answer winning: 3.85%.