Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/17/84; site godot.UUCP 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