奇数有1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41。43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75。77,79,81,83,85,87,89,91,93,95,99。偶数有2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32。34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66。68,70,72,74,76,78,80,82。84,86,88,90,92,94,96,98,100。质数有2,3,5,7,11,13,17,19,23,29,31,37,41,43,47。53,57,59,61,67,71,73,79,83,89,91,97。合数有4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26。27,28,30,32,33,34,35,36,38,39,40,42,44,45,46,48,49。50,51,52,54,55,56,58,60,62,63,64,65,66,68,69,70,72,74。75,76,77,78,80,81,82,84,85,86,87,88,90,92,93,94,95。96,98,99,100。奇数是不能被2整除的数,奇数可以分为正奇数和负奇数,人们通常把正奇数叫做单数。偶数是能够被2所整除的整数,正偶数也称双数。质数是在大于1的自然数中,除了1和它本身以外不再有其他因数的自然数。合数是自然数中除了能被1和本身整除外,还能被其他数(0除外)整除的数。奇数除以2余数为1,奇数的平方除以2,4,8余1。所有大于2的偶数都是合数,所有个位为4,6,8的自然数都是合数。 质数的最大公约数是1,所以不可能被整除。偶数的个位一定是0,2,4,6或8且一定能被2整除。参考资料来源