#math trivia for #May6: How can #127 be computed from 1, 2, and 7 using only two operations from +, -, *, /, and ^ (exponentiation)?

— Burt Kaliski Jr. (@modulomathy) May 6, 2012

Having exponentiation as an operator helps out here, because 2^7 = 128. The answer is

2^7 – 1 = 127