KEY:

Blue = cube numbers (1, 8, 27 and 64)

Green = squares which are not cubes (4, 9, 16, 25, 36 and 49)

Red = prime numbers (2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59 and 61)

Yellow = multiples of ten (10, 20, 30, 40, 50 and 60)

Purple = multiples of 11 which are not prime (22, 33, 44 and 55)

One number has been added to get you started.

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