diff options
Diffstat (limited to 'lib/prime.rb')
| -rw-r--r-- | lib/prime.rb | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/prime.rb b/lib/prime.rb index 650d279bc4..ce71d5e00f 100644 --- a/lib/prime.rb +++ b/lib/prime.rb @@ -144,6 +144,8 @@ class Prime # +value+:: an arbitrary integer to be checked. # +generator+:: optional. A pseudo-prime generator. def prime?(value, generator = Prime::Generator23.new) + value = -value if value < 0 + return false if value < 2 for num in generator q,r = value.divmod num return true if q < num |