Magic Square Party Trick - Numberphile

Matt Parker shows off his Magic Square party trick (unlike magicians, mathematicians often reveal their secrets).
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NUMBERPHILE

Videos by Brady Haran

[ExhaustedElox]

This coming out so soon after the other feels like a real Parker Square of an effort.

[GuiltyGearRockYou]

That is definitely not a parker square... ;D

[MrShagification]

I liked the part where the nerd called the other nerd a "nerd".

[MatteoBlooner]

3:34 you subtracted from a BILLION not a million

[KryssAA]

Those are *not* Parker Squares, I'm dissapointed ! :(

[endersdragon]

I love how Parker Square is already a thing... wonder how long it will last.

[Quicksilver_Cookie]

His reaction to a 42 being a number of choice is priceless :)

[TheHoaxHotel]

Octomom tried this with Punnett squares and got arrested.

[GMEGregz]

If you want to make the numbers appear less "suspicious", then you can add or subtract multiples of 4 from the number you are given, construct its square, and then add/subtract 1 to each entry for each multiple of 4 you subtracted/added respectively. For example with 58, you could have done the square for 42 again, but with 4 added to each entry, or the square for 34 with a 6 added to each entry.

[marowakcity]

calling someone a nerd on a numberphile video is not an insult, but a compliment

[iagas]

"Wow, I just turned 21! Now I'm finally old enough to.... have a magic square built around my age. Yep."

[joshuadoll]

One thing I find interesting is that when he shows the magic square in the graphic, the 4 square that is one row above the center and the one below the center add up to the number (I'll say 42) but the 4 square that is one column left of the center and one right of the center does not. Would be interesting to see if it is possible to make it so that those would add to 42 as well.

[mattmath]

I love that every comment is about the Parker Square.

[martinshoosterman]

I guess if someone happens to be 20 then you've really gotten yourselves into a parker square

[filippobonaventura]

Quite disappointed not to see Parker squares in this video... definitely want more Parker squares!!

[agmessier]

Rather than 'n', you could substitute (n-3i), and add 'i' to the other numbers. You can adjust 'i' to bring everything into proportion.

[LordWarden]

the corner numbers add up to '42' 22+7+9+4= 42 same with the numbers in between the edges, 6+24+12= 42 _ 23+5+11+1+2=42 notice the sequence of 3 row numbers and 4 row numbers..left and right sequence too

[olli]

Ben Hanlin didn’t notice that the 2x2 square of 11, 8, 5, 10 will always be constant of 34. If you want those extra 2x2 to work, n=34.

[andrewbloom]

"your birthday feels a little impersonal. How bout an arbitrary number?" Yeah that's much more personal lol...

[AlucardNoir]

Hey, at least it's not a Parker square.