SOLUTION: what comes next in the sequence. 1,3,7,13

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Question 97099: what comes next in the sequence.
1,3,7,13
Found 2 solutions by stanbon, checkley71:
Answer by stanbon(48558) About Me  (Show Source):
You can put this solution on YOUR website!
what comes next in the sequence.
1,3,7,13
next is 13+4 = 17
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Cheers,
Stan H.

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
1,3,7,13,21
RULE:
1+(2)=3
3+(4)=7
7+(6)=13
13+(8)=21