87 (number) - Wikipedia
3-aliquot tree. 5! - 4! - 3! - 2! - 1! = 87 the last two decimal digits of Graham's number. Cricket in Australia holds 87 as a superstitiously unlucky score
3-aliquot tree. 5! - 4! - 3! - 2! - 1! = 87 the last two decimal digits of Graham's number. Cricket in Australia holds 87 as a superstitiously unlucky score