Number Series Puzzles · Billy-B
Number Series #2
From Billy-B's legendary 1001 Puzzle Collection — preserved on Puzz.com since 1998.
Puzzle #2
11, 12, 26, 79, 81, 163, 491, 492, ?
Reveal Answer
986. The sequence goes multiply by 1 & then add 1, multiply by 2 & then add 2, multiply by 3 & add 1, multiply by 1 & add 2, multiply by 2 & add 1, multiply by 3 & add 2, & then the sequence repeats.
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