103 (number)

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
• Sam's Piano's song: the "103 Song"
• Mayke was hit by bus 103
• The number 103 is the calling card of the Ice Truck Killer on the television show Dexter
• "Fever 103" is the title of a famous poem by Sylvia Plath