27 lines
714 B
Plaintext
27 lines
714 B
Plaintext
function isPrime ($n) {
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if ($n -le 1) {$false}
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elseif (($n -eq 2) -or ($n -eq 3)) {$true}
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else{
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$m = [Math]::Floor([Math]::Sqrt($n))
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(@(2..$m | where {($_ -lt $n) -and ($n % $_ -eq 0) }).Count -eq 0)
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}
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}
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function semiprime ($n) {
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if($n -gt 3) {
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$lim = [Math]::Floor($n/2)+1
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$i = 2
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while(($i -lt $lim) -and ($n%$i -ne 0)){ $i += 1}
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if($i -eq $lim){@()}
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elseif(-not (isPrime ($n/$i))){@()}
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else{@($i,($n/$i))}
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} else {@()}
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}
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$OFS = " x "
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"1679: $(semiprime 1679)"
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"87: $(semiprime 87)"
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"25: $(semiprime 25)"
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"12: $(semiprime 12)"
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"6: $(semiprime 6)"
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$OFS = " "
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"semiprime form 1 to 100: $(1..100 | where {semiprime $_})"
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