# 1847

This number is a prime.

First adhesive U. S. Postage Stamps went on sale in the prime year of 1847. [Woods]

The year in which the Missouri ruffian and train robber Jesse James was born.

Prolific inventor Thomas Edison is a 'Prime Person' - born
in the emirp year 1847, died in the prime year 1931. He
lived 53 years of his life in the 19th Century and 31 years
in the 20th Century, both prime numbers. The phonograph,
the invention which first gained him fame, was in the prime
year 1877. In 1983 Congress designated February 11,
Edison's birthday, as **National Inventor's Day**, 2,
11, and 211 all primes. Furthermore, the following
references in Prime Curios! refer to Thomas Edison:

Smallest prime from initial digits of decimal expansion of the connective constant of the hexagonal lattice, which B. Nienhuis conjectured in 1982, and Hugo Duminil-Copin and Stanislav Smirnov proved in 2010 is sqrt(2+sqrt(2)) ~ 1.8477590650225735. [Post]

The smallest prime number that does not appear in the prime factorization of any known multiperfect number (as of October 2023). [Nie]