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[ July 27, 2003 ]
Expressions with a palindromic look.

Here is an expression that I wrote down a while ago.
When you consider only its digits you'll notice
that we deal here with a palindrome ie, 3233223323.

(3^2)^3 + ((3^2)2)^3 = 3^(2^3)

equivalent to 729 + 5832 = 6561 or 93 + 183 = 38.

A neat fact published in newsgroup sci.math.
and announced as a " multi-palindromic bi-digital curiosity ".
by Don Mcdonald dd. Sep 29 1996.

Exist there other non-trivial expressions possessing such a
beautiful palindromic (symmetrical) look regarding its digits ?


The 37th Mersenne Prime
23021377 — 1
has a prime exponent that can be rewritten
as a palindromic expression in the following manner

3021377 = 1 * 2 * 34 * 44432 + 1

and 1234444321 is a beautiful palindromic number.
A neat fact published in newsgroup rec.puzzles
makes this "an easy to remember mersenne prime ".
also by Don Mcdonald dd. May 15 2000.



A000149 Prime Curios! Prime Puzzle
Wikipedia 149 Le nombre 149














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