93 = 3 x 31
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It is: (73+93)/2 = 83 which is the average number
83 is a prime number, as its only factors are 1 and 83. 93 is composite, as its factors are 1, 3, 31 and 93.
It is 73.
93 is the only composite factor of 93.
Let's do some counting ! 3. 13. 23. 43. 53. 63. 73. 83. 93. And all the numbers beginning with 3. That makes.... 19 numbers !