15 is:

the natural number following 14;
in English, the smallest natural number with seven letters in its spelled name – fifteen;
in speech, often confused with 50;
a triangular number, hexagonal number, pentatope number and the 4th Bell number;
the double factorial of 5;
a composite number with proper divisors 1, 3, and 5;
the magic constant of the unique order-3 normal magic square;
a repdigit in binary;
the atomic number of phosphorus;
the day of the Hebrew month of Nisan when Passover begins;
the first point gained in a game of tennis;
the number of players in a rugby team;
the number on the back of a fullback’s jersey in rugby;
the age of eligibility in NZ to learn to drive;
the age in the UK at which a minor may be sent to jail to await trial;
the legal age someone may watch an R15 film;
the number of days in each of the 24 cycles of the Chinese calendar;
the number of checkers each side has in a backgammon game;
a restaurant in London owned by Jamie Oliver;
the number of function keys on most Mac keyboards;
the number of letters in the word hydropneumatics, uncopywriteable and misconjugatedly;
the number of minutes in a quarter hour;
the number corresponding to the devil in tarot cards;
a sun protection factor;
the anniversary celebrated by crystal;
the GST rate in Barbados, Cyprus, Ethiopia, India, Luxemburg, Madeira/Azores, Mauritius, Nicaragua, Trinidad/Tobago; and


[Disclaimer – I’ve sourced this information from web resources and have not verified it. Please don’t pick holes in it. The statement regarding NZ’s GST rate is correct. I’m sure you get the idea]

Contact Me

Please use the contact form if you have any questions or requests concerning my services.

I will respond to your request within 24 hours.


+64 274 899 008