Fiftyseven is the sixteenth discrete semiprime and the sixth in the (3.q) family. With 58 it forms the fourth discrete biprime pair. 57 has an aliquot sum of 23 and is the first composite member of the 23aliquot tree. Although 57 is not prime, it is jokingly known as the Grothendieck prime after a story in which mathematician Alexander ...The Sukhoi Su57 (Russian Сухой Су57; unconfirmed NATO reporting name Felon) is a stealth, singleseat, twinengine multirole fifthgeneration jet fighter being developed since 2002 for air superiority and attack operations. The aircraft is the product of the PAK FA (Russian ПАК ФА, short for Перспективный авиационный комплекс фронтовой ...
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