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A118255 a(1)=1 as 1 is not prime, then a(n)=2*a(n-1) if n is prime, a(n)=2*a(n-1)+1 if n not prime. +0
8
1, 2, 4, 9, 18, 37, 74, 149, 299, 599, 1198, 2397, 4794, 9589, 19179, 38359, 76718, 153437, 306874, 613749, 1227499, 2454999, 4909998, 9819997, 19639995, 39279991, 78559983, 157119967, 314239934, 628479869, 1256959738, 2513919477, 5027838955, 10055677911 (list; graph; listen)
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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.


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