#math trivia for #September18: #261 = 29*9; September is the 9th month. Is day 29*M always in month M? What about other multiples of M? — Burt Kaliski Jr. (@modulomathy) September 19, 2013 Yes, day 29*M is always in month M: Day 29:  January 29 Day 58:  February 27 Day 87:  March 28 Day 116: … Continue reading →