#math trivia for #August19: #231 is the fourth day-number consisting of the digits 1, 2 and 3, and the only one with which prime factor? — Burt Kaliski Jr. (@modulomathy) August 19, 2013 There are six day-numbers consisting of the digits 1, 2, and 3, and they have the following factorizations: 123 = 3 * … Continue reading