Pandigital prime: Difference between revisions
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=={{header|Quackery}}== |
=={{header|Quackery}}== |
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As per the Factor solution, only 4 and 7 digit pandigital numbers can be prime. Clearly the largest will have 7 digits. We start with the largest 7 digit pandigital number and work down until we find one that is prime. As <code>nextperm</code> generates permutations in lexicographical order the word <code>->revnum</code> subtracts each digit from 8 to give reverse |
As per the Factor solution, only 4 and 7 digit pandigital numbers can be prime. Clearly the largest will have 7 digits. We start with the largest 7 digit pandigital number and work down until we find one that is prime. As <code>nextperm</code> generates permutations in lexicographical order the word <code>->revnum</code> subtracts each digit from 8 to give reverse numerical order. |
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<code>nextperm</code> is defined at [[Permutations with some identical elements#Quackery]]. |
<code>nextperm</code> is defined at [[Permutations with some identical elements#Quackery]]. |
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