Well-known Sequences

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Well-known Sequences

Below are some of the most common sequences. It is useful to be familier with these and their formulae.

Even numbers 2, 4, 6, 8, 10, ... nth term = 2n

Odd Numbers 1, 3, 5, 7, 9, ... nth term = 2n - 1

Square Numbers 1, 4, 9, 16, 25, ... nth term = n2

Cube Numbers 1, 8, 27, 64, 125, ... nth term = n3

Triangle Numbers 1, 3, 6, 10, 15, ... nth term = ½ n (n + 1)

Prime Numbers 2, 3, 5, 7, 11, 13, etc. No known formula!

Fibonacci Numbers 1, 1, 2, 3, 5, 8, 13, ... Formula not needed for GCSE. Each term is found by adding the previous term!

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