2017-04-12 20:07:01拜足

數字 撲朔迷您 62

For any four consecutive Fibonacci numbers a, b, c, and d,
ad and 2bc form the legs of a Pythagorean triangle and cd
ab is the hypotenuse.
拜足 2017-04-12 20:21:13

5 8 13 21
105
208
273-40 = 233

233^2 = 105^2 + 208^2

拜足 2017-04-12 20:08:15

1 1 2 3
1 x 3 = 3
1 x 2 x 2 =4
1 x 3 x 2 - 1 = 5

5^2 = 3^2 + 4^2