April 2003 - mathfun@mailman.xmission.com

[math-fun] April is National Math Awareness Month
by The Purple Streak, Hilarie Orman 03 Apr '03

03 Apr '03

Three days to the wind, and what have you done to celebrate? My contribution to Math Awareness Month was not to shout out the answer when a local public official fell apart in mid-sentence over 1 1/2 of 4. I suggest National Math Compassion Month, instead. Or have March be National Arithmetic Compassion Month and let April be National Math Fun Month. Hilarie

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[math-fun] Re tic tac toe
by N. J. A. Sloane 03 Apr '03

03 Apr '03

There are several sequences in the OEIS that are relevant. This one almost answers your question: %I A061529 %S A061529 0,0,46080,8707262054400,9325207163130772193280000, %T A061529 282114820702333003219864073866838016000000, %U A061529 519832475166470446526522688211309314023066144499302400000000000 %N A061529 Number of complete games of n X n tic-tac-toe ending in a draw. %H A061529 J. Ferry, <a href="http://ladybug.xs4all.nl/arlet/puzzles/solutions/contrib/tictactoe.html">n X n tic-tac-toe</a> (Mathematica programs followed by results) %H A061529 <a href="http://www.research.att.com/~njas/sequences/Sindx_Th.html#TTT">Index entries for sequences related to tic-tac-toe</a> %Y A061529 Cf. A061526, A061527, A061528, A061530. %K A061529 nonn %O A061529 1,3 %A A061529 Jim Ferry (jferry(a)alum.mit.edu) May 04 2001 NJAS

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[math-fun] Sequence puzzle
by asimovd＠aol.com 02 Apr '03

02 Apr '03

Here is yesterday's sequence puzzle now fixed (I hope). PUZZLE: What characterizes the following sequence, of which the first 25 terms are listed? 5, 8, 11, 13, 14, 17, 18, 20, 23, 25, 26, 28, 29, 32, 33, 35, 38, 39, 41, 43, 44, 46, 47, 48, 50, ... Note: This is most naturally just a certain (infinite) subset of the positive integers, which has been arranged in numerical order. --Dan

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[math-fun] OOPS -- Re: Sequence puzzle -- Ignore it for now.
by asimovd＠aol.com 02 Apr '03

02 Apr '03

Please ignore this puzzle -- I need to think about it a little more first. --Dan

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[math-fun] Sequence puzzle
by asimovd＠aol.com 02 Apr '03

02 Apr '03

PUZZLE: What characterizes this (infinite) sequence, the first few terms of which are as follows: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 17, 18, 20, 23, 25, 26, 28, 29, 32, 33, 38, 39, 41, 43, 46, 48, 50, ... ? (Perhaps it's better to describe this as a subset of the positive integers which has been put in ascending order.) --Dan

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