Repunit primes: Difference between revisions
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(→J: add) |
(→J: only a few seconds faster) |
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=={{header|J}}== |
=={{header|J}}== |
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Slow (runs several minutes) |
Slow (runs for several minutes): |
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<syntaxhighlight lang="j">repunitp=. 1 p: |
<syntaxhighlight lang="j">repunitp=. 1 p: ^ %&<: [ |
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(2x + i. 15) (;/@[ ,. repunitp"0/ <@# ]) |
(2x + i. 15) (;/@[ ,. repunitp"0/ <@# ]) i.&.(p:inv) 1000</syntaxhighlight> |
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{{out}} |
{{out}} |
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<pre> |
<pre> |
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