305 (number)

305 is the natural number following 304 and preceding 306.

← 304 305 306 →
List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	three hundred five
Ordinal	305th (three hundred fifth)
Factorization	5 × 61
Divisors	1, 5, 61, 305
Greek numeral	ΤΕ´
Roman numeral	CCCV
Binary	1001100012
Ternary	1020223
Senary	12256
Octal	4618
Duodecimal	21512
Hexadecimal	13116

In mathematics

• 305 is an odd composite number with two prime factors.^[1]
• 305 is the convolution of the first 7 primes with themselves.^[2]
• 305 is the fifth hexagonal prism number which is defined by (n+1)(3n²+3n+1).^[3]
• 305 is the hypotenuse of two Pythagorean triples. 305²=207²+224²=136²+273².^[4][5]

Other fields

• The calendar years 305 AD and 305 BC.
• 305 is the number for several highways across the countries of Canada, China, India, Japan, the Philippines, and the United States.

References

1. "Facts about the integer". mathworld.wolfram.com.
2. Sloane, N. J. A. (ed.). "Sequence A014342 (Convolution of primes with themselves)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
3. Sloane, N. J. A. (ed.). "Sequence A005915". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
4. "Pythagorean triples". mathworld.wolfram.com.
5. Tobin-Campbell, Christopher. "Systems of Pythagorean Triples" (PDF). www.whitman.edu.