1931

This number is a prime.

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1931 and 1933 are the smallest set of twin primes in which one is a Sophie Germain prime and the other a Honaker prime. [Gaydos]

The first 3-way tie among non-trivial ending digits of Sophie Germain primes, i.e., 1, 3, and 9, occurs at 1931. [Gaydos]

There are exactly 666 zeros in the first 1931 sphenic numbers. [Gaydos]