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Category: | Series |

Submitted By: | griphook |

Fun: | (2.26) |

Difficulty: | (3.1) |

What are the next two numbers in this series?

9 10 11 12 13 14 21 ? ?

The series is the number NINE shown in decreasing Reference Numbers(BASE)i.e. from Base 10 to Base 2.

NINE is 9 in base 10, 10 in base 9, 11 in base 8...21 in base 4, 100 in base 3 and 1001 in base 2.

Hint: BASEd suggests the use of reference numbers and Divine NINES suggests the number nine.

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