MathDB

We can change a natural number

n

in three ways: a) If the number

n

has at least two digits, we erase the last digit and we subtract that digit from the remaining number (for example, from

123

we get

12 - 3 = 9

); b) If the last digit is different from

0

, we can change the order of the digits in the opposite one (for example, from

123

we get

321

); c) We can multiply the number

n

by a number from the set

\{1, 2, 3,..., 2010\}

. Can we get the number

21062011

from the number

1012011

Problem Statement