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combinatorics

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Answers

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36

Show that the sequence $1,2,3,4,5,6,7,8,9,1,0,1,1,1,2,1,3,1,4,1,5,1,6,1,7,1,8,1,9,2,0,2,1,\cdots$ isn't periodic

Aug 30, 2013

35

Can a row of five equilateral triangles tile a big equilateral triangle?

Apr 17, 2017

25

Proving $\sum_{k=0}^n(-1)^k\binom nk=0$

Dec 27, 2011

23

What is the significance of the power of $3$ in the sequence of primes given by $\lfloor A^{3^n}\rfloor ?$

Aug 23, 2013

15

Longest known sequence of identical consecutive Collatz sequence lengths?

Aug 19, 2013

Questions

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24

Generalization of "easy" 1-D proof of Brouwer fixed point theorem

Jan 2, 2012

17

Infinite Sequence of Inscribed Pentagrams - Where does it converge?

Mar 24, 2013

12

For abelian groups: does knowing $\text{Hom}(X,Z)$ for all $Z$ suffice to determine $X$?

Feb 14, 2015

9

Category on integers with the usual product and coproduct?

Aug 26, 2013

6

Sums like $\sum_{n=0}^{\infty}\frac{1}{a^{n}+b^{n}}$?

May 2, 2015

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combinatorics

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elementary-number-theory

61

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4

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geometry

47

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6

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group-theory

35

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2

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discrete-geometry

35

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1

post

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+10

Partitions of $\{1,\dots,n\}$ with no consecutive integers in each block is counted by $B(n-1)$?

+10

Finding the GCD of three numbers?

+10

Can a row of five equilateral triangles tile a big equilateral triangle?

+10

Complete lattices on $\mathbb{Q}$ and $\mathbb{R}$ ordered by $\leq$

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