Well, there might be another answer but the one I wrote goes like dis:
1,2,4,8,15
1=1
2=2
3=1+2
4=4
5=4+1
6=4+2
7=4+2+1
8=8
9=8+1
10=8+2
11=8+2+1
12=8+4
13=8+4+1
14=8+4+2
15=15
16=15+1
17=15+2
18=15+2+1
19=15+4
20=15+4+1
21=15+4+2
22=15+4+2+1
23=15+8
24=15+8+1
25=15+8+2
26=15+8+2+1
27=15+8+4...