World!Of
Numbers

WON plate
97 |

[ April 9, 2001 ]
How many palindromes can you find
that are the products of two ninedigital numbers ?

 On April 9, 2001  I guess I was luckyas I found rather unexpectedly a solutionwith the very first ninedigital multiplicand 123456789. 123456789 * 538721694 = 66508850505880566

There exists so many solutions rendering this WONplate
too small to display them all ( final total 220 as of [ June 14, 2002 ] ).
Hence I created a webpage twonine.htm where I display
all the palindromic products that I encountered.

Can you discover the first palindromes being the products
of three, four and more ninedigitals ?

On [ April 20, 2012 ]
Carlos Rivera included the above 'three' question in his Puzzle 633
Soon afterwards Giovanni Resta came with this smallest & highest solution

128576934 x 135278964 x 167538942 = 2914131213909093121314192 [25]
and
923458167 x 982673514 x 983254671 = 892262201210191012102262298 [27]

WONplate 115 investigates the pandigital version of this topic !

A000097 Prime Curios! Prime Puzzle
Wikipedia 97 Le Nombre 97 Numberland 97