1, 3, 5, 15, 17, 51, 85, 255.
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255
1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765.
1 goes into 5 and 4 evenly.
The only whole number that goes into "7" evenly is 7.The number "7" also goes into the number "70" evenly (10x7=70).
The number that goes into both 84 and 105 evenly is 21.