blog
tyblography

categories

architecture (24)
on location (19)
random thoughts (1,143)
staff (22)
the design life (270)
the writing life (377)
blog archive




Math Is Beautiful

81 is the only number* that is the square of the sum of its digits: (8 + 1)^2 = 81.

And 18 is the only number that’s twice the sum of its digits: (8 + 1) x 2 = 18.

That is all.

*Well, except for 1, I suppose. But that feels like cheating. (Oh—and if exhaustive lists of the properties of specific numbers is your jam, Robert Munafo has you covered.)



*name

*e-mail

web site

leave a comment


back to top    |    recent posts    |    archive