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Numbers whose product is the reversal
of the product of their reversals.


Find two numbers whose product is the reversal of the product of their reversals.
Source : "Mathematical Recreations & Essays"
by W.W.Rouse Ball & H.S.M. Coxeter, Twelfth Ed., p. 14.

Answer : for example,
312 x 221 = 68952
213 x 122 = 25986
See here how Dr Huen Y.K. (Singapore) tackles this issue analytically.

Note : Dr. Huen Y.K. has a very interesting website about
Goldbach's Sequences that's worth more than a casual visit.
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Dr Huen also found something which may be of interest to the readers.
It's about palindromes showing up in nature's very DNA sequences!
Here I collect websources about palindromic DNA

A000017 Prime Curios! Prime Puzzle Richard Phillips
Wikipedia 17 Le Nombre 17 Numberland 17














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E-mail address : pdg@worldofnumbers.com