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A pronic number is a number that is the product of two consecutive integers, that is, a number of the form (+). [1] The study of these numbers dates back to Aristotle.They are also called oblong numbers, heteromecic numbers, [2] or rectangular numbers; [3] however, the term "rectangular number" has also been applied to the composite numbers.
Therefore, is triangular (is an integer) if and only if + is square. Consequently, a square number is also triangular if and only if + is square, that is, there are numbers and such that =.
n.o.s. = not otherwise specified meaning a collective entry to which substances, mixtures, solutions or articles may be assigned if a) they are not mentioned by name in 3.2 Dangerous Goods List AND b) they exhibit chemical, physical and/or dangerous properties corresponding to the Class, classification code, packing group and the name and description of the n.o.s. entry [4]
Year 1225 was a common year starting on Wednesday of the Julian calendar. Events. By place. Mongol Empire. Autumn – Subutai is ...
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Pages in category "1225" The following 4 pages are in this category, out of 4 total. This list may not reflect recent changes. ...
5 May – War between France and England breaks out when Louis VIII of France attacks Poitou and northern Gascony. [7] June–August – Siege of Bedford: rebels surrender to Hubert de Burgh. [12] 10 September – Arrival of the first Franciscan friars in England. [7] 1225. Magna Carta affirmed by Henry III, in return for issuing a property tax ...
1225 births (15 P) E. 1225 establishments (6 C, 1 P) This page was last edited on 4 November 2019, at 20:15 (UTC). Text is available under the Creative Commons ...