Two closely inter-related sequences:
1,3,4,6, 6, 8, 8,13,13,12,12,14,14,24,24,18,18,20,20,...
3,4,7,7,12,12,15,15,18,18,28,28,24,24,31,31,39,39,42,...
Just to puzzle some fresher minds,
before submitting...
Thanks,
and sorry for non-interested seqfans - just ignore it!
Zak
7:08 AM 10/7/2010