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What is the missing number represented as "?"

10,11,12,13,14,15,16,17,20,22,24, ?,100,121,10000

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The answer is

31

Please see OEIS sequence A008713.
"16 in base 16 - n"
10, 11, 12, 13, 14, 15, 16, 17, 20, 22, 24, 31, 100, 121, 10000, 1111111111111111

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