Numbers with prime digits whose sum is 13: Difference between revisions
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observation that the only digits which are prime are [2, 3, 5, 7] |
observation that the only digits which are prime are [2, 3, 5, 7] |
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so the numbers of interest cannot have more than 6 digits. |
so the numbers of interest cannot have more than 6 digits. |
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To save space, both |
To save space, both only present the count of the number of solutions; this is done using the stream counter: |
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using the stream counter: |
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def count(s): reduce s as $_ (0; .+1); |
def count(s): reduce s as $_ (0; .+1); |
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