Chowla numbers: Difference between revisions
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=={{header|J}}== |
=={{header|J}}== |
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'''Solution:''' |
'''Solution:''' |
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<lang j> |
<lang j>chowla=: >: -~ >:@#.~/.~&.q: NB. sum of factors - (n + 1) |
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chowla=: +/@uniqFactors |
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intsbelow=: (2 }. i.)"0 |
intsbelow=: (2 }. i.)"0 |
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37 0 |
37 0 |
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countPrimesbelow 100 1000 10000 100000 1000000 10000000 |
countPrimesbelow 100 1000 10000 100000 1000000 10000000 |
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25 168 1229 9592 78498 |
25 168 1229 9592 78498 664579 |
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findPerfectsbelow 35000000 |
findPerfectsbelow 35000000 |
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6 28 496 8128 33550336</lang> |
6 28 496 8128 33550336</lang> |
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=={{header|Julia}}== |
=={{header|Julia}}== |
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<lang julia>using Primes, Formatting |
<lang julia>using Primes, Formatting |
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