Burt Kaliski Jr. (@modulomathy) 4/1/12 10:35 PM #math trivia for #April1: #92 = 7*13+1, so April is congruent to January; both start on Sunday. What other months are congruent this year? The answer is a simple matter of modular arithmetic. Reduced modulo 7, the lengths of the 12 months in a leap year follow the … Continue reading →