Talk:81 (number)

Latest comment: 6 years ago by Arthur Rubin (alternate) in topic Bingo names -
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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)Reply

Specific and general

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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)Reply

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)Reply
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)Reply
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)Reply

It is also the only number…

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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)Reply

Hell's Angels

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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)Reply

Bingo names -

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Please see Wikipedia talk:WikiProject Numbers#List of British bingo nicknames for a centralized discusion as to whether Bingo names should be included in thiese articles. Arthur Rubin (alternate) (talk) 23:35, 3 June 2018 (UTC)Reply