I calculated those gears and got (in gear inches) 96-90-87-81-75-68-68-61-54-52-50-47-42-38-38-29-24. OK, a pair of duplicates and 54,52 and 50, but not awful. No huge gaping gaps. 13 different gears.
I raced a 5-speed with 110-102-95-87-83-81-76-75-67-60. Almost exactly the same gears plus higher and no low ones. I was happy as a clam riding that. (I was a pure climber who knew that his only chance to inflict his will in races was to blaze uphill so I geared my bike so I had no choice.) Now I raced the then popular Campy standard 42-50something X a tight 13-19 FW. Very different shifting patterns and we never double shifted to fine tune gearing.
Ben