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Twenty is a pronic number, as it is the product of consecutive integers, namely 4 and 5. [3] It is the third composite number to be the product of a squared prime and a prime (and also the second member of the 22 × q family in this form). It has an aliquot sum of 22; a semiprime, within an aliquot sequence of four composite numbers (20, 22, 14 ...
Synonyms. Euarctos americanus. The American black bear ( Ursus americanus ), also known as the black bear, is a species of medium-sized bear endemic to North America. It is the continent's smallest and most widely distributed bear species. The American black bear is an omnivore, with a diet varying greatly depending on season and location.
The World Chess Championship is played to determine the world champion in chess. The current world champion is Ding Liren, who defeated his opponent Ian Nepomniachtchi in the 2023 World Chess Championship. Magnus Carlsen, the previous world champion, had declined to defend his title. The first event recognized as a world championship was the ...
Rembrandt [a] Harmenszoon van Rijn was born on 15 July 1606 in Leiden, [1] in the Dutch Republic, now the Netherlands. He was the ninth child born to Harmen Gerritszoon van Rijn and Neeltgen Willemsdochter van Zuijtbrouck. [8] His family was quite well-to-do; his father was a miller and his mother was a baker's daughter.