Centuries: 2nd century - 3rd century - 4th century
Decades: 180s 190s 200s 210s 220s - 230s - 240s 250s 260s 270s 280s
Years: 232 233 234 235 236 - 237 - 238 239 240 241 242
Births
Deaths
... is now a perfect square; it is the square of (x + b/(2a)). The right side can be written as a single fraction; the common denominator is 4a2. W ...