#math trivia for #September15: #258 consists of three digits in an arithmetic progression. Which other numbers in the 200s do? — Burt Kaliski Jr. (@modulomathy) September 16, 2013 The digits 2, 5 and 8 form an arithmetic progression because each successive pair has the same difference:  5-2 = 8-5 = 3.   The answers consist … Continue reading →