I heard this puzzle in a quiz I participated in:
10, 11, 12, 13, 14, 15, 16, 17, 20, 22, 24, ?, 100, 121, 10000
What is the missing number?
(You don't need to do any big calculations, and you don't need any advanced mathematical knowledge - just one basic concept that's known to many non-mathematical people.)
Answer
According the google the answer be 31.
The sequence is 16 in base 16-n.
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