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Perfect totient numbers: Difference between revisions
Added implementation in Rust
(Added implementation in Dart) |
(Added implementation in Rust) |
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Line 2,535:
{{Out}}
<pre>3, 9, 15, 27, 39, 81, 111, 183, 243, 255, 327, 363, 471, 729, 2187, 2199, 3063, 4359, 4375, 5571
</pre>
=={{header|Rust}}==
<lang rust>use num::integer::gcd;
static mut CACHE:[i32;10000] = [0; 10000];
fn is_perfect_totient(n: i32) -> bool {
let mut tot = 0;
for i in 1..n {
if gcd(n, i) == 1 {
tot += 1
}
}
unsafe {
let sum = tot + CACHE[tot as usize];
CACHE[n as usize] = sum;
return n == sum;
}
}
fn main() {
let mut i = 1;
let mut count = 0;
while count < 20 {
if is_perfect_totient(i) {
print!("{} ", i);
count += 1;
}
i += 1;
}
println!("{}", " ")
}
</lang>
{{Out}}
<pre>3 9 15 27 39 81 111 183 243 255 327 363 471 729 2187 2199 3063 4359 4375 5571
</pre>
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