Merge remote-tracking branch 'upstream/master'

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diff --git a/challenge-150/abigail/java/ch-2.java b/challenge-150/abigail/java/ch-2.java
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+++ b/challenge-150/abigail/java/ch-2.java
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+//
+// See https://theweeklychallenge.org/blog/perl-weekly-challenge-150
+//
+
+//
+// Run as: ln ch-2.java ch2.java; javac ch2.java; java ch2
+//
+
+import java.util.*;
+
+public class ch2 {
+    public static void main (String [] args) {
+        int [] primes = {2, 3, 5, 7, 11, 13, 17, 19};
+        for (int n = 1; n <= 500; n ++) {
+            boolean has_square = false;
+            for (int p: primes) {
+                if (n % (p * p) == 0) {
+                    has_square = true;
+                    break;
+                }
+            }
+            if (!has_square) {
+                System . out . printf ("%d ", n);
+            }
+        }
+        System . out . printf ("\n");
+    }
+}