Number Series Puzzle

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?




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Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
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Amazing Facts

Jigsaw puzzles

Jigsaw puzzles soared in popularity during the great depression, as they provided a cheap, long-lasting, recyclable form of entertainment.