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Brian Hopkins

Member for 12 years
Last seen this week

faculty.saintpeters.edu/pages/…
metro NYC

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combinatorics

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2,500 Rep.

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Answers

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Score Activity Newest

6

Counting nested integer partitions

May 20, 2011

4

Number of partitions contained within Young shape $\lambda$

Aug 19, 2012

4

Bulgarian Solitaire: Number of root loops and which numbers have multiple root loops

Aug 20, 2012

4

How many ordered quadruples $(a,b,c,d)$ satisfy $a+b+c+d=18$ under various conditions?

Aug 9, 2020

4

An unfriendly question about "friendly" binary sequences

Oct 30, 2022

Questions

Score Activity Newest Views

13

Fibonacci, compositions, history

May 18, 2011

7

Citation for subset complement result

Mar 27, 2013

2

Perturbing integer roots

Mar 23, 2022

1

Permutations, products, and unit fractions

Nov 25, 2018

0

reference request for Padovan number identity, comments on history

Apr 3, 2020

Tags

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combinatorics

65

Score

50

posts

integer-partitions

55

Score

42

posts

discrete-mathematics

13

Score

12

posts

number-theory

13

Score

11

posts

math-history

11

Score

7

posts

Reputation

+10

How many ordered quadruples $(a,b,c,d)$ satisfy $a+b+c+d=18$ under various conditions?

+15

Is this formula new and worth being published?

+10

An unfriendly question about "friendly" binary sequences

+10

Sum of integers closest to a given number

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Nov 19, 2021
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May 8, 2013
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May 20, 2011

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May 19, 2011
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Votes cast

135

upvotes

57

question votes

78

answer votes

1

this week