1,2,4,5,8,10,20,40
9,18,27,36,45,54,63,72,81,90,99,108,...
15,30,45,60,75,90,105,120,135,150,165,...
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1,2,4,5,8,10,20,40
9,18,27,36,45,54,63,72,81,90,99,108,...
15,30,45,60,75,90,105,120,135,150,165,...