1,3,5,9,15,17,45,51,85,153,255,765
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Yes
Yes. 3,060 divided by 4 is 765.
No. A number that ends in 5 is divisible by 5, so it can't be prime unless it is 5 itself. Also, 7+6+5 = 18. Since 18 is divisible by 3 and by 9, 765 is also divisible by 3 and 9. It is easily seen that 765 factorises to 3 x 3 x 5 x17.
3.4% of 765= 3.4% * 765= 0.034 * 765= 26.01
1, 3, 5, 9, 15, 17, 25, 45, 51, 75, 85, 153, 225, 255, 425, 765, 1275, 3825