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RobPratt
  • Member for 5 years
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  • NC, USA
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  • Senior R&D Manager, SAS Institute Inc.
  • Ph.D. in Operations Research, The University of North Carolina at Chapel Hill
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56
What is the optimal number of dice to roll a Yahtzee in one roll?
Feb 6, 2020
42
What is the closed form of the $f$ with $f(1)=1$, $f(2)=7$ and $f(n)=7f(n-1)-12f(n-2)$ ($n\ge 3$)?
Jul 14, 2019
24
Is there a generating function for any finite sequence of random numbers?
Apr 7, 2020
23
Can we arrange $\{1,...,16\}$ in $4\times 4$-grid so {products of rows} = {products of columns}?
Jan 22, 2020
15
Number of ways to label die with opposing faces summing to 7
Jan 1, 2020
14
Does it exist a way how to find the ways to get from one point to another when certain points must be avoided in a grid?
Mar 21, 2020
14
How to geometrically determine number of holes for a triangle
Dec 17, 2022
12
Express $\sum_{j=1}^{n}\sum_{i=1}^{n} \frac{1}{i(i+j)}$ in terms of harmonic numbers
Jul 16, 2019
12
Faster approach: Find the smallest integer $a$ such that $P = a\cdot1!\cdot2!\cdot3!\cdot4!\cdot5!....\cdot18!$ is a perfect square.
Jun 2
11
With $x_1^2+3x_2^2+2x_1x_2=32$, find max value of $|x_1-x_2|$
Jul 4, 2022
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Checkmate 30 kings with rooks
26
Which heptomino is it obvious can't tile the plane?
25
What node does 11 point to?
25
How to linearize the product of two binary variables?
24
A COVID-19 puzzle: How large a class do you need to fit 30 pupils?