39 lines
1.0 KiB
Java
39 lines
1.0 KiB
Java
import java.util.ArrayList;
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import java.util.List;
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public class PythagoreanQuadruples {
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public static void main(String[] args) {
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long d = 2200;
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System.out.printf("Values of d < %d where a, b, and c are non-zero and a^2 + b^2 + c^2 = d^2 has no solutions:%n%s%n", d, getPythagoreanQuadruples(d));
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}
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// See: https://oeis.org/A094958
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private static List<Long> getPythagoreanQuadruples(long max) {
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List<Long> list = new ArrayList<>();
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long n = -1;
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long m = -1;
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while ( true ) {
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long nTest = (long) Math.pow(2, n+1);
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long mTest = (long) (5L * Math.pow(2, m+1));
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long test = 0;
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if ( nTest > mTest ) {
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test = mTest;
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m++;
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}
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else {
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test = nTest;
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n++;
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}
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if ( test < max ) {
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list.add(test);
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}
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else {
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break;
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}
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}
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return list;
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}
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}
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