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第32题:Pandigital products
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 through 5 pandigital.
The product 7254 is unusual, as the identity, 39 × 186 = 7254, containing multiplicand, multiplier, and product is 1 through 9 pandigital.
Find the sum of all products whose multiplicand/multiplier/product identity can be written as a 1 through 9 pandigital.
[size=14.256px]HINT: Some products can be obtained in more than one way so be sure to only include it once in your sum.
[size=14.256px]一个n位的重排数是由1-n所有数字只使用1次所组成的数。例如,15234是1-5的一个重排数。
[size=14.256px]7254是一个不一般的数字,39 × 186 = 7254,其乘数、被乘数、积,组成 了一个1-9的重排数。
[size=14.256px]求:所有乘数、被乘数、积能组成 1-9的重排数的积的和(有些积可以不同方式取得,只要计算一次)
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