Burt Kaliski Jr. (@modulomathy) #math trivia for #February29: #60 shares a prime factor with 44 smaller integers. Which 16 smaller integers are relatively prime to 60? The 16 smaller (positive) integers that don’t share a prime factor with 60 are: 1, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 49, 53, … Continue reading →