Double pandigital number divisible by 11
November 30, 2014
We call a positive integer double pandigital if it uses all the digits 0 to 9 exactly twice (with no leading zero). For example, 40561817703823564929 is one such number.
How many double pandigital numbers are divisible by 11?
Written by gamwe6 who lives and works in San Francisco building useful things. You should follow him on Twitter