[libmath-prime-util-perl] 36/54: Small change to PP znprimroot

[Partha P. Mukherjee]

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ppm-guest pushed a commit to annotated tag v0.38
in repository libmath-prime-util-perl.

commit b7c29e978c29c33f6ccf031d21f4dbd26f5642e9
Author: Dana Jacobsen <dana at acm.org>
Date:   Wed Feb 19 16:28:42 2014 -0800

    Small change to PP znprimroot
---
 lib/Math/Prime/Util/PP.pm | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/Math/Prime/Util/PP.pm b/lib/Math/Prime/Util/PP.pm
index 35ae158..bc3894c 100644
--- a/lib/Math/Prime/Util/PP.pm
+++ b/lib/Math/Prime/Util/PP.pm
@@ -1722,9 +1722,12 @@ sub znprimroot {
   }
   return if $n % 4 == 0;
   my $a = 1;
-  my $phi = euler_phi($n);
-  # Check that a primitive root exists.
-  return if !is_prob_prime($n) && $phi != Math::Prime::Util::carmichael_lambda($n);
+  my $phi = $n-1;
+  if (!is_prob_prime($n)) {
+    $phi = euler_phi($n);
+    # Check that a primitive root exists.
+    return if $phi != Math::Prime::Util::carmichael_lambda($n);
+  }
   my @exp = map { Math::BigInt->new("$_") }
             map { int($phi/$_->[0]) }
             Math::Prime::Util::factor_exp($phi);

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