Talk:Base 13

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This page was listed on Wikipedia:Votes for deletion in May, 2004. The result of that discussion was to keep the article. For an archive of the discussion, see Talk:Base 13/Delete.

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[edit] ROT13

I removed:

This system was used in some encryption algorithms.

Is this is a reference to ROT13? If so, it's incorrect, as ROT13 uses addition modulo 26. — Matt 03:33, 6 Sep 2004 (UTC)

[edit] Base 15?

6×9=42 in base 15, or am I insane? --68.13.122.35 11:31, 3 January 2006 (UTC)

6*9 is 54(dec), whereas 42(base 15) is 4*15 + 2 = 62(dec). -- Jao 14:32, 4 January 2006 (UTC)

can someone please explain how 6*9=42 in base13? i'm confused. I can't find the mathematical pattern.--unsigned by User:75.3.181.17

I think User:68.13.122.35 meant base 13.

As for User:75.3.181.17, can you find the pattern in 6*7=42₁₀? I don't think I can.

6*9=42₁₃ can be verified either by doing the product in decimal (it's 54₁₀) and converting either 54₁₀ into base-13 or 42₁₃ into decimal to see that they are the same - or by doing a repeated sum in base 13, e.g.:

2*9=9+9=15₁₃ (where 15₁₃is of course 13+5=18₁₀)

4*9=2*9+2*9=15+15=2A₁₃ (where A₁₃=10₁₀)

6*9=4*9+2*9=2A+15=42₁₃ (using A+5=12₁₃)

Are you still confused?--Niels Ø 21:49, 30 June 2006 (UTC)