Burt Kaliski Jr. (@modulomathy) 3/19/12 10:37 PM #math trivia for #March19: #79 has one of the highest digit sums of any two-digit prime: 7+9=16. Which two-digit prime has a higher sum? The only two-digit prime with a higher digit sum than 79 is 89. Indeed, the only two-digit numbers with a higher digit sum than … Continue reading