# 137

This number is a prime.

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The sum of the squares of the first seven digits of π is the smallest such prime: 3^2 + 1^2 + 4^2 + 1^2 + 5^2 + 9^2 + 2^2 = 137. [Post]

Mabkhout (1993) showed that every number x^4 + 1, for x > 3, has a prime factor greater than or equal to 137. He used a classical result of Størmer. [Post]

The smallest prime with 3 distinct digits that remains prime if any one of its digits is removed. [Post]

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

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