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Path: utzoo!watmath!clyde!cbosgd!ihnp4!godot!bruce
From: bruce@godot.UUCP (Bruce Nemnich)
Newsgroups: net.math
Subject: Re: the insatiable prime-hunger of professor ziff
Message-ID: <568@godot.UUCP>
Date: Tue, 4-Dec-84 00:08:00 EST
Article-I.D.: godot.568
Posted: Tue Dec  4 00:08:00 1984
Date-Received: Tue, 4-Dec-84 08:47:12 EST
References: <3511@ecsvax.UUCP>
Reply-To: bruce@godot.UUCP (Bruce Nemnich)
Organization: Thinking Machines, Cambridge, MA
Lines: 21
Summary: 


I just started reading net.math again; I missed the first palindrome
prime discussion.  However, I dug out some prime-testing routines I had
and came up with a few results this evening.

Re decimal numbers with all one-digits, yes, the 19- and 23-digit ones
are prime.  The next in the sequence is 315 digits.

Re palindrome primes, my favorite is 123456789012343210987654321.  It is
the only such prime < 10**261 (and probably more; that's how far my
routine has crunched so far).

Re primes of the form 1+10**n, I can think of no reason why there should
be none (for n even, of course).  Other than 101, there are none through
1+10**200.



-- 
--Bruce Nemnich, Thinking Machines Corporation, Cambridge, MA
  ihnp4!godot!bruce, bjn@mit-mc.arpa ... soon to be bruce@godot.arpa