aparler/RosettaCodeData
1
0
Fork 0
Code Issues 12 Pull requests 3 Projects Releases Packages Wiki Activity Actions

Data commit

Browse source
This commit is contained in:
Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
199093 changed files with 3378972 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

39
Task/Carmichael-3-strong-pseudoprimes/Java/carmichael-3-strong-pseudoprimes.java Normal file
View file

@ -0,0 +1,39 @@
public class Test {
static int mod(int n, int m) {
return ((n % m) + m) % m;
}
static boolean isPrime(int n) {
if (n == 2 || n == 3)
return true;
else if (n < 2 || n % 2 == 0 || n % 3 == 0)
return false;
for (int div = 5, inc = 2; Math.pow(div, 2) <= n;
div += inc, inc = 6 - inc)
if (n % div == 0)
return false;
return true;
}
public static void main(String[] args) {
for (int p = 2; p < 62; p++) {
if (!isPrime(p))
continue;
for (int h3 = 2; h3 < p; h3++) {
int g = h3 + p;
for (int d = 1; d < g; d++) {
if ((g * (p - 1)) % d != 0 || mod(-p * p, h3) != d % h3)
continue;
int q = 1 + (p - 1) * g / d;
if (!isPrime(q))
continue;
int r = 1 + (p * q / h3);
if (!isPrime(r) || (q * r) % (p - 1) != 1)
continue;
System.out.printf("%d x %d x %d%n", p, q, r);
}
}
}
}
}