>> Are there any odd members of A006881 that do not occur in the sequence? > A candidate would be 3*89 = 267. ... > But it's not obvious to me how to make this search finite. A002072. The last pair of 89-smooth numbers is 9591468737351909375, 9591468737351909376. 3*89 can't occur after that. -- Don Reble djr at nk.ca