User talk:154.20.32.55

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[edit] Twin prime

Please do not put questions about the content of Wikipedia articles into the articles themselves. That is what the discussion page associated with the article is for. As for your question, regarding the final digit of n in a twin prime pair (6n - 1, 6n + 1): if n ended with the digit 1, i.e. if it were of the form 10k + 1, then 6n - 1 = 60k + 5 would be divisible by 5; similar reasoning applies to the other excluded digits. —David Eppstein 21:03, 5 August 2007 (UTC)