such that the sum of the squares of the digits
is equal to the sum of the non-trivial divisors of
For example, 581, whose divisors are 1, 7, 83 and 581,
is a Canada number because .
The name of these numbers is due to the fact they were defined by some
mathematicians from Manitoba University to celebrate the 125th anniversary of Canada.
The Canada numbers are
125, 581, 8549, and 16999.
Pictorial representation of remainders (mod 2, 3, ...,11) frequency. For a table of values and more details click here