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1 Odd one out

Find the odd one out: 49, 57, 87, 131, 133.

The main category is composite numbers.

49 is a composite number; its factors are 1, 7 and 49.

133 is also a composite number with factors 1, 7, 19 and 133.

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What is three times three?

Comments (2)

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Regular
mosays...

57 is known as the "Grothendieck prime" because Alexander Grothendieck gave it as a prime number example.

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New
Cleosays...

131 is the only prime number

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