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From: dje@5941ux.UUCP
Newsgroups: net.math
Subject: Re: interesting division by 3 property
Message-ID: <418@5941ux.UUCP>
Date: Fri, 23-Sep-83 16:26:59 EDT
Article-I.D.: 5941ux.418
Posted: Fri Sep 23 16:26:59 1983
Date-Received: Mon, 26-Sep-83 06:00:43 EDT
References: <657@ihuxf.UUCP> mtplx1.142
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Some time ago, I submitted an article on testing for divisibility by 7.

The rule is:  10t+u is divisible by 7 if and only if t-2u is divisible by 7.

Examples and proof available on request.

Dave Ellis / Bell Labs, Piscataway NJ
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