7 is a Prime number so 9,7 and 26 have nothing in common but 1.
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1 goes into 7 and 5 and 8 and 9 and 6
No - odd numbers end with one of the digits 1, 3, 5, 7, or 9, which the number 26 does not. 26 is therefore even.
you add the next odd number in the sequence. first you add 1, then 3, 5, 7, 9...