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I am reinstating the example, as a mathematical calculation is not subject to copyright. Okay, I was imprecise with the attribution for the example, giving the impression that it was taken from copyright source. This is the situation as far as I see it:
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The knowledge that 1264460, 1547860, 1727636, 1305184 are sociable goes back to a H. Cohen, On amicable and sociable numbers, Math. Comp. 24 (1970), pp. 423-429.
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The working I presented was mine, based on this mathematical result. Mathworld (whose copyright I believe I am respecting) does not present this working.
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It is a mathematical result. Not copyrightable in itself. (Copyright can apply to expressions of an idea - patents can apply to an algorithm)
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Knowledge. If you would like to participate, please visit the project page, where you can join
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I used
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As always, I am prepared to be proven wrong - IANAL (but IAAM). Cheers,
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There are plenty of other sources for this result. For example,
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