Named after Stetson University mathematician Erich Friedman, is a number that can be calculated using its own digits, such as 736 = 36 + 7 or 3281 = (38 + 1) / 2.
A โniceโ Friedman number is one in which the digits are used in order, such as 3685 = (36 + 8) ร 5 or 3972 = 3 + (9 ร 7)2.
|