Divisibility Tricks

Additional information

Featuring Tony Padilla... Check out Brilliant (and get 20% off their premium service): https://brilliant.org/numberphile (sponsor)

Extra footage and trick from this interview: https://youtu.be/ZWeUNUCf2rI

Card trick and shuffling videos on Numberphile: http://bit.ly/Cards_Shuffling

Belphegor's Prime: https://youtu.be/zk_Q9y_LNzg

Numberphile playing cards (limited and occasional supply): http://bit.ly/NumberphileCards

I Love Norrie stickers (created just to annoy Tony): https://teespring.com//i-love-norrie-numberphile

Tony is a professor at the University of Nottingham.