3,3,9, 15,33,63

The first number =3

The second number =3 (the first number) *2-3=3

The third number =3 (the second number) *2+3=9

The fourth number =9*2-3= 15

The fifth number = 15*2+3=33

The sixth number =33*2-3=63

1, 3,3,6,7, 12, 15,24 odd items 1, 3,7,15 = >; The difference between two adjacent numbers in the new series is 2,4,8 = >; Equal proportion, even terms 3, 6, 12, 24, etc.

Cube of 0, 7, 26, 63,1240-102-173-1264-1635-124.

2/3, 1/2,3/7,7/ 184/ 1 12/3 = 4/6, 1/2 = 5/ 10,3/7 = 6.