Sunday Times Teaser 2690 – Leaving Present
by Graham Smithers
When our maths teacher retired, his colleagues gave him a number of packs of spring bulbs, each pack containing 65 bulbs. He planted all these bulbs in groups, each group having a different prime number of bulbs. It turned out that each of the digits 0 to 9 appeared exactly once among these primes, a result that would have been impossible with fewer packs.
How many bulbs were there in the smallest and largest groups?