I'm Eight

Find a great variety of ways of asking questions which make 8.

Repeaters

Choose any 3 digits and make a 6 digit number by repeating the 3 digits in the same order (e.g. 594594). Explain why whatever digits you choose the number will always be divisible by 7, 11 and 13.

Oh! Hidden Inside?

Find the number which has 8 divisors, such that the product of the divisors is 331776.

A One in Seven Chance

Stage: 3 Challenge Level:

What is the remainder when $2^{164}$ is divided by 7?