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Mma: 13 is not prime!

• To: mathgroup at smc.vnet.net
• Subject: [mg4603] Mma: 13 is not prime!
• From: Felix Holderied <felix at ira.uka.de>
• Date: Wed, 21 Aug 1996 03:25:22 -0400
• Organization: IRF Uni-Karlsruhe
• Sender: owner-wri-mathgroup at wolfram.com

Please help me:

In[]:=
        PrimeQ[13]
Out[]=
        True


In[]:=
        PrimeQ[p] /.{p->13}
Out[]=
        False

WHY?

Greetings, Felix

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