1240s

Millennium:	2nd millennium
Centuries:	12th century 13th century 14th century
Decades:	1220s 1230s 1240s 1250s 1260s
Years:	1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
Categories:	Births Deaths By country By topic Establishments Disestablishments

Fibonacci. Fibonacci sequence and Liber Abbaci

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