Composite numbers k with no single digit factors whose factors are all substrings of k: Difference between revisions
Content added Content deleted
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def iter(n: Int, start: Int): Boolean = { |
def iter(n: Int, start: Int): Boolean = { |
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val limit = math.sqrt(n).floor.toInt |
val limit = math.sqrt(n).floor.toInt |
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(start to limit).dropWhile(n % _ > 0).headOption match { |
(start to limit by 2).dropWhile(n % _ > 0).headOption match { |
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case Some(v) if v < 10 => false |
case Some(v) if v < 10 => false |
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case Some(v) => |
case Some(v) => |
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15317 59177 83731 119911 183347 192413 1819231 2111317 2237411 3129361 |
15317 59177 83731 119911 183347 192413 1819231 2111317 2237411 3129361 |
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5526173 11610313 13436683 13731373 13737841 13831103 15813251 17692313 19173071 28118827 |
5526173 11610313 13436683 13731373 13737841 13831103 15813251 17692313 19173071 28118827 |
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time elapsed: |
time elapsed: 59821 ms |
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</pre> |
</pre> |
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