What Is the Next Number in the Sequence 10, 10, 11, 12, 15, 16, 21?

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10 10 11 12 15 16 21
 
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22

?
 
Why?
 
22. because every second term in the sequence is separated by 1. ie. 10 10 11 12 15 16 21
is separated by 0, 1, 1, 3, 1, 5, 1, hence 22, my guess is that the number after that will be 27 and then 28, etc etc.
 

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