Puzzle 746
What number comes next in this sequence:
1 · 2 · 6 · 24 · 120 · ?
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Answer
720.
Each term is a factorial, 6! = 1 x 2 x 3 x 4 x 5 x 6 = 720.
Puzzle 747
What number comes next in this sequence:
1 · 4 · 11 · 20 · 31 · 44 · ?
Puzzle Copyright © Kevin Stone
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Hint
A tricky base 8 question.
Answer
61.
Each term is a square expressed in base eight, 7 2=49 = 61 in base 8.
Puzzle 748
What number comes next in this sequence:
1 · 3 · 6 · 11 · 18 · ?
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Hint
The sequence is related to prime numbers.
Answer
29.
Each term increases by the next prime number.
