Talk:81 (number)

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Link for -20[edit]

I don't think the link to -20 is what this article wants. Check to see if it is correct. Georgia guy 00:51, 31 Jan 2005 (UTC)

I just heard an unconfirmed report that a new number has been discovered between 80 and 81. If true, this could have major implications for number 81. —Preceding unsigned comment added by Kackermann (talkcontribs) 14:31, 21 October 2007 (UTC)

Specific and general[edit]

That exhibits the sequence of digits except 8 is just the base-10 case of the general rule that for any base n gives the sequences of digits except n−2. Cf. in base 12, in base 16 (0.0123456789ABCDF…) to name just two. --109.67.200.119 (talk) 16:13, 10 June 2010 (UTC)

I think you're right. Perhaps we should say that in the article. In fact, I will. — Arthur Rubin (talk) 17:09, 10 June 2010 (UTC)
Thanks. It's of high probability I'm right, because I tested this on a great number of bases using bc, and they all bear it out. However, as with trying out a million triangles of two equal edges and one equal angle and finding out they overlap, that only makes for high probability, not mathematical proof. I don't know a proof. --109.67.200.119 (talk) 17:35, 10 June 2010 (UTC)
Let me see....(I don't know how to do alignments in TeX.)

(Informative) Also applies to signed-digit bases. (676 = square of 26) in balanced base 27 (which stands for three balanced ternary digits much like hexadecimal stands for four binary digits): (the vinculum marks the negative digits). --79.178.202.78 (talk) 17:06, 26 July 2010 (UTC)

It is also the only number…[edit]

Where the sum of its digits equal its square root. Is anyone going to revert this if I make an article change? —Preceding unsigned comment added by Da5id403 (talkcontribs) 23:48, 12 May 2011 (UTC)

Hell's Angels[edit]

81 is also the number for the Hells Angels MC. 8=H 1=A — Preceding unsigned comment added by 71.231.251.27 (talk) 16:37, 8 September 2014 (UTC)