# 1801

This number is a prime.

The first full and correct proof of the Fundamental Theorem of Arithmetic was first published by Gauss in his classic work *Disquisitiones Arithmeticae* (1801). The theorem states that every natural number greater than 1 can be written as a product of primes in exactly one way (apart from rearrangement).

The minor planet Ceres was found in the year 1801. [Poo Sung]

Contemporary painter Michael Eastman employs numbers, letters, and a William Morris pattern as abstract elements in the oil on canvas painting *1801: 14 Prime Numbers*.

The smallest prime consisting of all of the cube digits (i.e., 0, 1, and 8) at least once. [Gupta]

The larger of two successive cuban primes (1657, 1801) for which inserting any digit between adjacent digits never yields another prime. [Post]

(1801^2+1801+1)/3 = 1081801. [Vrba]

"Pure mathematics is religion." - Friedrich von Hardenberg, circa 1801

The smallest multidigit prime which is the number of ways to write n^2 as the sum of n odd numbers, disregarding order. In this case, n = 7 is also a prime. [Post]

Silk weaver Joseph Marie Jacquard invented a loom that uses punched cards to control weaving patterns in 1801. [Cox]

Johann Bode’s Uranographia of 1801 is a classic star atlas. [Ridpath]