Friedman Numbers

Alex Bellos discusses how the Incans used knots in string (Quipu) to record numbers.Check out Brilliant (get 20% off their premium service): https://brillian...

Professor Ed Copeland on Friedman Numbers - more below.

Adopted Numbers: http://www.numberphile.com/supporters/

FRIEDMAN NUMBERS (Friedman's site): http://bit.ly/FriedmanNumbers

Pandigital Numbers: http://youtu.be/gaVMrqzb91w
Vampire Numbers: http://youtu.be/3ZMnVd4ivKQ

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