Today is 31 day of the year.

31 is prime.

31 = 7 + 11 + 13, the sum of three consecutive primes.

31 is a Mersenne prime.

31 is the only known Mersenne emirp.

31 is a happy number.

31 is a primorial prime.

31 is the member of one primitive Pythagorean triple (31, 480, 481)

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