| ||||
---|---|---|---|---|

Cardinal | one hundred three | |||

Ordinal | 103rd (one hundred third) | |||

Factorization | prime | |||

Prime | 27th | |||

Greek numeral | ΡΓ´ | |||

Roman numeral | CIII | |||

Binary | 1100111_{2} | |||

Ternary | 10211_{3} | |||

Quaternary | 1213_{4} | |||

Quinary | 403_{5} | |||

Senary | 251_{6} | |||

Octal | 147_{8} | |||

Duodecimal | 87_{12} | |||

Hexadecimal | 67_{16} | |||

Vigesimal | 53_{20} | |||

Base 36 | 2V_{36} |

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

## In mathematics

103 is the 27th prime number. The previous prime is 101, making them both twin primes. It is also a happy number.^{[1]}

103 is a strictly non-palindromic number.^{[2]}

103 is the smallest prime number in which the period length of its reciprocal is exactly 1/3 of the maximum length.

## In science

- The atomic number of lawrencium, an actinide.

## In other fields

When "and" is required for the number name, 103 is the smallest number requiring 18 letters when spelled out in English.

**One hundred three** is also:

- The emergency telephone number for ambulance in Belarus, India and Ukraine

## See also

- List of highways numbered 103
- 103rd Street (disambiguation), multiple rapid transit stations

## References

- Wells, D.
*The Penguin Dictionary of Curious and Interesting Numbers*London: Penguin Group. (1987): 133

**^**"Sloane's A007770 : Happy numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-05-27.**^**"Sloane's A016038 : Strictly non-palindromic numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-05-27.