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[ January 4, 2000 ]
In this paragraph I am searching for the largest Square and Cube whose decimal expansion
contains no palindromic substrings except of course their single digits themselves.

Square RootPalfree Square
10104574 ( first above 107 ) 102102415721476 ( length 15 )

Cube RootPalfree Cube
10069605 ( first above 107 ) 1021027182906953620125 ( length 22 )

InfoPalfree Prime
( first above 107 ) 10210219 ( length 8 )

All these examples our put in the table only as a starting point.
Your task is to find the largest possible palfree square, cube and/or prime.
My guess is that the above record palfree numbers will be approximately 45 digits long ...
but I could be wrong!
Good luck with this research topic and keep me posted!

Continued at WONplate 46...

A000028 Prime Curios! Prime Puzzle Richard Phillips
Wikipedia 28 Le Nombre 28 Numberland 28














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