# What is the pattern in the sequence 1, 3, 4, 7, 6, 12, 8, 15, 13, ??

What is the pattern in the sequence 1, 3, 4, 7, 6, 12, 8, 15, 13, ??
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Penelope Powers
1=1
3=1+2
4=1+3
7=1+2+4
6=1+5
12=1+2+3+6
8=1+7
15=1+2+4+8
13=1+3+9