The Little Math Puzzle Contest: Puzzles #1 to 5

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Puzzle #1. What meaning can you find in the following?

A
MA
NSE
EKSO
RDERA
NDAPAT
TERNINA
LLTHINGS

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Puzzle #2

What number comes next?  3,  5,   8,   13, ..........

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Puzzle #3

What are the next three letters?.... O T T F F S S E __ __ __

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Puzzle #4

What is the next number?.... 77 49 36 18 __

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Puzzle #5

What are the next 2 numbers?  6, 9, 18, 21, 42, 45, ___, ___

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