303
303 is a composite number, odd, a calendar year.
303 (three hundred three) is an odd 3-digit number. It is a composite number with 4 divisors, and factors as 3 × 101. Its digits read the same forwards and backwards, so it is a palindromic number. Written other ways, in Roman numerals it is CCCIII and in binary, 100101111.
Interestingness
Historical context — 303 AD
Calendar year
Year 303 (CCCIII) was a common year starting on Friday of the Julian calendar.
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Historical context — 303 BC
Calendar year
Year 303 BC was a year of the pre-Julian Roman calendar.
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Year facts
- Year type
-
Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
- Days in year
- 365
- ISO weeks
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 303
- Ended on
-
Thursday
December 31, 303
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
300s
300–309
- Century
-
4th century
301–400
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,723
1723 years before 2026.
In other calendars
- Hebrew
-
4063 / 4064 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Water zodiac:Pig
Sexagenary cycle position 60 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
846 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
295 / 296 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
225 / 224 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 3 × 101
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√303 = [17; (2, 2, 5, 2, 2, 34)]
Period length 6 — the block in parentheses repeats forever.
Representations
- In words
- three hundred three
- Ordinal
- 303rd
- Roman numeral
- CCCIII
- Binary
- 100101111
- Octal
- 457
- Hexadecimal
- 0x12F
- Base64
- AS8=
- One's complement
- 65,232 (16-bit)
- Scientific notation
- 3.03 × 10²
- As a duration
- 303 s = 5 minutes, 3 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓏺𓏺𓏺
- Greek (Milesian)
- τγʹ
- Mayan (base 20)
- 𝋯·𝋣
- Chinese
- 三百零三
- Chinese (financial)
- 參佰零參
Digit at this position in famous constants
- π — Pi (π)
- Digit 303 = 2
- e — Euler's number (e)
- Digit 303 = 5
- φ — Golden ratio (φ)
- Digit 303 = 6
- √2 — Pythagoras's (√2)
- Digit 303 = 8
- ln 2 — Natural log of 2
- Digit 303 = 3
- γ — Euler-Mascheroni (γ)
- Digit 303 = 5
Also seen as
UTF-8 encoding: C4 AF (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.47.
- Address
- 0.0.1.47
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.1.47
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 303 is an active NANP area code (North American Numbering Plan).
- Primary area
- Denver
- Region
- Colorado
- Country
- United States
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.
Heard as a frequency, 303 Hz is closest to:
- Concert pitch (A4 = 440 Hz): D♯4 (311.1 Hz, -46¢ — about midway to D4)
- Scientific pitch (C4 = 256 Hz): D♯4 (304.4 Hz, -8¢)
- Baroque pitch (A4 = 415 Hz): E4 (310.9 Hz, -45¢ — about midway to D♯4)
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.