Fifteen is a composite number, its proper divisors being 1, 3 and 5.
There are fifteen players in a rugby football team.
... 2nd century - 3rd century - 4th century Decades: 190s 200s 210s 220s 230s - 240s - 250s 260s 270s 280s 290s Years: 237 238 239 240 241 - 242 ...