Show that
Prove that if
Does there exist a natural number which, when divided by the sum of its digits, gives a quotient and remainder both equal to the number 2011?
Prove that:
How many different four-digit numbers, divisible by 4, can be made up of the digits 1, 2, 3 and 4,
a) if each number can occur only once?
b) if each number can occur several times?
Is the number 12345678926 square?
It is known that
Without calculating the answer to
Prove the divisibility rule for
Can you come up with a divisibility rule for
Is