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Pandigital prime sets
Using all of the digits 1 through 9 and concatenating them freely to form decimal integers, different sets can be formed. Interestingly with the set {2,5,47,89,631} , all of the elements belonging to it are prime.
How many distinct sets containing each of the digits one through nine exactly once contain only prime elements?
题目:
使用从 1 到 9 所有数字,将其任意地连接起来,使之组成十进制数,会得到不同的集合。{2,5,47,89,631}就是比较有趣的集合,它的所有元素都属于质数。
请问满足 1 - 9 都使用且只用过一次,而且所有元素都是质数的不同集合有多少个?
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