Number Series Puzzles · Billy-B
Number Series #24
From Billy-B's legendary 1001 Puzzle Collection — preserved on Puzz.com since 1998.
Puzzle #24
My primary objective is cumulative multiplication. I know, it's an odd objective. 3 10 21 44 65 102 ?
Reveal Answer
133. A very tough one! The numbers represent the odd prime numbers, multiplied by the number for their place in the series of odd prime numbers. 3 is the first odd prime number, & because it is first, it is multiplied by 1; 5 is the second odd prime number, & is thus multiplied by 2, which yields 10, & so on.
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