# 1871

This number is a prime.

1871 is the smallest prime factor of (3^17-1)/2.

The Paris Commune of 1871 was the first attempt at a socialist society.

1871!/1781! - 1 is prime. [Patterson]

The great Chicago fire erupted in 1871. [Green]

The least prime p congruent to 11 mod 12 such that (p-1)/2 does not divide the numerator of the Bernoulli number B(p-1). [Wesolowski]

Portmanteau words like repdigit (from *rep*eated and *digit*) can be traced to Lewis Carrol's book *Through the
Looking-Glass* (1871). After all, he was quite a mathlete.

"Whistler's Mother" was painted in 1871. [Quinley]

(There are 3 curios for this number that have not yet been approved by an editor.)

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