Tagged with palindrome …

#math trivia #262 solution

#math trivia for #September19: #262 is a palindrome that’s twice a palindrome. Which other day-numbers (1-365) have this property? — Burt Kaliski Jr. (@modulomathy) September 20, 2013 We’re restricted to even palindromes, so our set of candidates (same forward and reverse) is: 2, 4, 6, 8 22, 44, 66, 88 202, 212, 222, 232, 242, … Continue reading →

#math trivia #171 solution

#math trivia for #June19: #171 is one of five palindrome day-numbers (same forward and reverse) divisible by 9. What are the others? — Burt Kaliski Jr. (@modulomathy) June 20, 2012 The sum of the digits of a number divisible by 9 is itself divisible by 9; this follows from the fact that powers of 10 … Continue reading →