World!Of
Numbers

WON plate
156 |


[ August 7, 2004 ]
A palindromic formula
by Paul Oliverio (email)


It is best if done only on a calculator.
Simplifying the steps -- or seeing them written out --
makes it too obvious what is happening.

Start with 36k–63

where k >= 10

let n = # of digits

reverse the digits and divide by 9

then multiply by 25*10(n–2)

add k and multiply this result by 36

subtract 63

result is a palindrome !



A000156 Prime Curios! Prime Puzzle
Wikipedia 156 Le nombre 156














[ TOP OF PAGE]


( © All rights reserved )
Patrick De Geest - Belgium - Short Bio - Some Pictures
E-mail address : pdg@worldofnumbers.com