# 331

This number is a prime.

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The smallest prime p such that the concatenation of p and p^2 is a Cyclops number (331109561). [Gaydos]

331 is the smallest integer n that has the same sums of digits as the nth prime number (2221) and the nth composite number (412). [Gaydos]

The smallest lucky Honaker number. [Gaydos]

(There is one curio for this number that has not yet been approved by an editor.)

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