They seem to mean that 97 is a Prime number whereas the rest of them are composite numbers.
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Eleven numbers less than 105 are relatively prime to 105. They are 82, 83, 86, 88, 89, 92, 94, 97, 101, 103, and 104.
80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 102, 104, 105, 106, 108, 110.
No.
Well, just multiply numbers that equal 86. I'll say them. 1,2, 43 and 86.
If the numbers are in feet then 86 times 20 = 1720 square feet