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easyNumbersAll teasers

Odd one out: 3, 5, 7, 9, 11, 13

One number does not belong with the primes in this short list. From the free puzzle set on Think Fanny — next try When are clock hands at right angles?.

Think Fanny number puzzle formulas on a chalkboard

The puzzle

Which number is the odd one out?

3, 5, 7, 9, 11, 13

Look for the property shared by every number except one.