19! - 18! + 17! - 16! + ... + 1 is prime.
19 = 4!−(4 + 4 ÷ 4) = (4 + 4 − .4) ÷ .4
Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
19! - 18! + 17! - 16! + ... + 1 is prime.
19 = 4!−(4 + 4 ÷ 4) = (4 + 4 − .4) ÷ .4
Undergraduate Texts in Mathematics
Graduate Studies in Mathematics