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prime numbers and sum numers课件
Prime Numbers and Sum Numbers;1 2 3 4 5 6 7 8 9 10 ; The numbers which have only 1 and themselves as their divisors are called prime numbers.(质数);1 2 3 4 5 6 7 8 9 10 ; The numbers which have other divisors besides 1 and themselves are called sum numbers.(合数);1 2 3 4 5 6 7 8 9 10 ;;Natural numbers; ; ;Guess the teacher’s telephone number:;Tick the numbers in right places with “√”;Thanks for listening!; ; A Chinese mathematician Chen Jingrun proved that any plenitude even number can be the sum of one prime number plus the product of two prime numbers. For instance: 8=2+2×3, 20=5+3×5… His research results have been termed as Chen’s Theorem.
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