Ultra useful primes: Difference between revisions

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(→‎{{header|J}}: redo for j9.4 which fixes arbitrary precision performance problems)
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<syntaxhighlight lang="j">uup=: {{
ref=. x: 2x^2^2x^y+1
k=. 1
while. -. 1 p: ref-k do. k=. k+2 end.
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