# 37

This number is a prime.

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The smallest Riesel prime whose emirp is also a Riesel prime. [Loungrides]

The only two-sided emirp whose the reversal is also a two-sided emirp. [Loungrides]

The only idoneal prime (emirp) formed by concatenating n idoneal primes (n=2). [Loungrides]

The smallest unique emirp. [Loungrides]

The only non-titanic prime p of form p=6^x+1 for x a prime and the only non-titanic emirp for x any number, (case x=2). [Loungrides]

The only double-digit prime p such that the form x!+p, gives primes for each digit x of the six successive single digits 3, 4, 5, 6, 7, 8. [Loungrides]

The reversal of 37 is the 37th odd number, and this is the only pair of emirps (p, q), such that q is the pth odd number. [Loungrides]