Curzon numbers: Difference between revisions
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(Python: much faster with modpow) |
(→{{header|Ruby}}: Switched to modular pow like Python) |
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<syntaxhighlight lang="ruby">def curzons(k) |
<syntaxhighlight lang="ruby">def curzons(k) |
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Enumerator.new do |y| |
Enumerator.new do |y| |
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(1..).each |
(1..).each do |n| |
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m = k * n + 1 |
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y << n if k.pow(n, m ) + 1 == m |
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end |
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end |
end |
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end |
end |
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[2,4,6,8,10].each do |base| |
[2,4,6,8,10].each do |base| |
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puts "Curzon numbers with k = #{base}:" |
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puts curzons(base).take(50).join(", ") |
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puts "Thousandth Curzon with k = #{base}: #{curzons(base).find.each.with_index(1){|_,i| i == 1000} }","" |
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end</syntaxhighlight> |
end</syntaxhighlight> |
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Thousandth Curzon with k = 10: 46845. |
Thousandth Curzon with k = 10: 46845. |
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</pre> |
</pre> |
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=={{header|Rust}}== |
=={{header|Rust}}== |
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<syntaxhighlight lang="rust">fn modpow(mut base: usize, mut exp: usize, n: usize) -> usize { |
<syntaxhighlight lang="rust">fn modpow(mut base: usize, mut exp: usize, n: usize) -> usize { |
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