It looks to me as though the pattern is x2, +2, -1
1x2=2 2+2=4 4-1=3
3x2=6 6+2=8 8-1=7
7x2=14 14+2=16 16-1=15
15x2=30 30+2=32 32-1=31
So the next few terms are 15, 30, 32, 31, 62, 64, 63
15,30,32,31,62,64,63..... (*2,+2,-1)
a,b,c,d = 1,2,4,3 b=2a c=b+2 d=c-1 7*2=14 14+2=16 16-1=15
75 (times 3, divided by2, plus 1)
15
The simplest sequence appears to be 15 1*2=2 2+2=4 4-1=3 3*2=6 6+2=8 8-1=7 7*2=14 14+2=16 16-1=15 Multiply by 2 Add 2 Subtract 1 Repeat
Nothing "completes" the sequence because it goes on forever - without end.
15 The sequence seems to be x2, +2, -1.
18
15.
15
15,30,32,31,62,64,63..... (*2,+2,-1)
Type your answer here... 15
17 19 20
a,b,c,d = 1,2,4,3 b=2a c=b+2 d=c-1 7*2=14 14+2=16 16-1=15
15 (times 2, plus 2, minus 1)
What number best completes the sequence 1 1/2 5 10 1/2 18
1. double 2. add two 3. subtract one 4. repeat 1 to 3