9514 1404 393
Answer:
THEN IT WOULD BE A FOOT
Step-by-step explanation:
The list of products begins with the numbers you already have:
2599, 14652, 61404, 17034,
46176, 67704, 14735, 19392,
28084, 23907, 11172, 23340, 3712,
10476, 63364, 23208, 14769, 40128
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I found it tedious to compute these and do the look-up, so I wrote a little program to do it for me. Even typing the numbers and letters into the program was tedious enough.
The answer to the riddle is ...
THEN IT WOULD BE A FOOT