For ten points, name this mathematician best known for his contributions to number theory and his elegant proofs of Bertrand's conjecture, Chebyshev's Theorem, and the Prime Number Theorem.
The winner of a national examination in 1930, he entered university where he was part of the "Anonymous Group." He settled for a time in the United States, although his negligence of a "no trespassing" sign, while discussing mathematics with his colleagues near a military radio transmitter on Long Island, resulted in an FBI record. For ten points, name this mathematician best known for his contributions to number theory and his elegant proofs of Bertrand's conjecture, Chebyshev's Theorem, and the Prime Number Theorem.
The winner of a national examination in 1930, he entered university where he was part of the "Anonymous Group."
Paul {Erdos}