Medium Puzzles 

What word is the same backwards and upside down?

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What number comes next in this sequence:

2 · 5 · 9 · 19 · 37 · ?

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Which letter comes next in this sequence:

Y · P · I · D · ?

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What is the smallest positive integer, which …

… when multiplied by 7 gives a number consisting of only 6's?

Puzzle Copyright © Kevin Stone

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