import java.util.ArrayList; import java.util.List; public class PythagoreanQuadruples { public static void main(String[] args) { long d = 2200; 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)); } // See: https://oeis.org/A094958 private static List getPythagoreanQuadruples(long max) { List list = new ArrayList<>(); long n = -1; long m = -1; while ( true ) { long nTest = (long) Math.pow(2, n+1); long mTest = (long) (5L * Math.pow(2, m+1)); long test = 0; if ( nTest > mTest ) { test = mTest; m++; } else { test = nTest; n++; } if ( test < max ) { list.add(test); } else { break; } } return list; } }