The Nineteenth Byte

10:37 AM

Can you make the number 29 from the numbers 1,2,3,4 using +-*/ and each number exactly once?

You can use brackets as much as you like

11:01 AM

@Anush no "hi all"?! :)

@ngn hi all

time is in reverse :)

@ngn do you think it's possible?

it's very close the the four 4s question so I am not sure I can pose it on main

13     +-
  )   (  )
 4      *
2)))   /

@Anush ^ there, "29" :)

that is hard to read :)

oh I see :)

very nice

@Anush is this for pe 93?

oh no it wasn't! It was homework for a child :)

from that question I am guessing 29 is not possible

thanks that is a really good find

it's not really clear to me how to brute force it

11:14 AM

@Anush i have solutions in k for pe 1..100 here

for this particular problem: try all possible parenthesizations × all possible choices of 3 from +-*/

× permutations of 1234

11:52 AM

But it's not possible for 29 so what does it mean?

@ngn what do you get for 29?

@Anush well, all of my answers are correct, so i guess the authors of that problem were right about 29

ax + by, a & b are coprime code-golf integer number-theory Backstory A doctor in Berlin, after analyzing his medical history, has realized that all of the results of his integral measurement results can be represented in the form of \$23x+28y\$. However, he could have extended his theory. ...

12:13 PM

Could you let me know what solution you have for 29?

@ngn could you let me know your solution for 29?

@Anush well, i mean there isn't one. the problem says: "1 to 28 can be obtained before encountering the first non-expressible number"

Divide into 2 isosceles triangles code-golf integer geometry Given the measures of two of the interior angles of a triangle (x and y; the other angle can be easily calculated with 180 - x - y), draw a line segment that cuts this triangle into two isosceles triangles. You need to output the angle...

Oh ok. I didn't understand you meant when you said all your answers are correct

@Anush authors

What does authors mean?

12:24 PM

@Anush above i wrote "the authors of that problem we right", not "the answers .."

ok.. i also said "answers" but that's answers to project euler problems

anyway, if they say there's no way to shuffle 1234+-*/ and get 29, there very likely isn't

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1:31 PM

@Anush Can you evaluate 2x-1 using +-*/ exactly once?

You can use brackets and the symbol x as much as you like. (This puzzle is invented by sporeball, so credits to him.)

Neil

2:09 PM

@Anush 2⁴⁺¹-3 = 29

2 hours later…

4:14 PM

Very nice