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Problem 1 Published on 05 October 2001 at 06:00 pm [Server Time] If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Find ...

Problem 4 Published on 16 November 2001 at 06:00 pm [Server Time] A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99. ...

Difficulty rating: 5% Problem 32 We shall say that an $n$-digit number is pandigital if it makes use of all the digits $1$ to $n$ exactly once; for example, the $5$-digit number, $15234$, is $1$ throu...