Ivan Mikheevich Pervushin, Russian mathematician and academic (born 1827)

Ivan Pervushin

Russian clergyman and mathematician

Ivan Mikheevich Pervushin was a Russian clergyman and mathematician of the second half of the 19th century, known for his achievements in number theory. He discovered the ninth perfect number and its odd prime factor, the ninth Mersenne prime. Also, he proved that two Fermat…