103 (number)

Not to be confused with 103 AD or 103 BC.

← 102 103 104 →
← 100 101 102 103 104 105 106 107 108 109 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred three
Ordinal	103rd (one hundred third)
Factorization	prime
Prime	27th
Greek numeral	ΡΓ´
Roman numeral	CIII, ciii
Binary	11001112
Ternary	102113
Senary	2516
Octal	1478
Duodecimal	8712
Hexadecimal	6716

103 (one hundred [and] three) is the natural number following 102 and preceding 104.

In mathematics

103 is a prime number, and the largest prime factor of $6!+1=721=7\cdot 103$. The previous prime is 101. This makes 103 a twin prime. It is the fifth irregular prime, because it divides the numerator of the Bernoulli number $$B_{24}=-\frac{236364091}{2730}=-\frac{103\cdot 2294797}{2730}.$$

The equation $64^3+94^3=103^3+1$ makes 103 part of a "Fermat near miss".

There are 103 different connected series-parallel partial orders on exactly six unlabeled elements.

103 is conjectured to be the smallest number for which repeatedly reversing the digits of its ternary representation, and adding the number to its reversal, does not eventually reach a ternary palindrome.