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ChrisR

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1 – 50 of 157

Problem 54755. List odd twin composites

Created by:ChrisR

Tagsprimes,number theory,sequence

2

Solvers

43

大小

2

Solvers

43

大小

Problem 54750. Find the length of stream affected by a spill

Created by:ChrisR

Tagssolver,calculus,maximum

2

Solvers

80

大小

2

Solvers

80

大小

Problem 54740. Count the ways to make Scorigami

Created by:ChrisR

Tagsnumber theory,sports,coin problems

2

Solvers

99

大小

2

Solvers

99

大小

Problem 54735. Solve an ODE: concentrations predicted by the cells-in-series model

Created by:ChrisR

Tagsordinary differential equations,river mixing

2

Solvers

47

大小

2

Solvers

47

大小

Problem 54710. Compute the period of a pendulum started from a finite initial angle

Created by:ChrisR

Tagsphysics,special functions

2

Solvers

18

大小

2

Solvers

18

大小

Problem 47793. Find the smallest prime with n inside

Created by:ChrisR

Tagsprimes,strings,sequence

14

Solvers

31

大小

14

Solvers

31

大小

Problem 54695. Spell musical triads

Created by:ChrisR

Tagsmusic,pattern,chords

2

Solvers

115

大小

2

Solvers

115

大小

Problem 54680. Determine whether a number is practical

Created by:ChrisR

Tagsfactors,number theory,sequence

2

Solvers

121

大小

2

Solvers

121

大小

Problem 54670. Solve an ODE: precocious pair’s porcine pursuit

Created by:ChrisR

Tagsdifferential equations,separable,reduction of order

3

Solvers

23

大小

3

Solvers

23

大小

Problem 54660. Generate the Figure-Figure sequence

Created by:ChrisR

Tagssequence,figure/ground,hofstadter

4

Solvers

56

大小

4

Solvers

56

大小

Problem 54645. Determine whether the input is an anagram number

Created by:ChrisR

Tagssequence,anagram,wordplay

4

Solvers

194

大小

4

Solvers

194

大小

Problem 54620. List the Euclid numbers

Created by:ChrisR

Tagsprimes,sequence,infinitude

5

Solvers

83

大小

5

Solvers

83

大小

Problem 54610. Evaluate the Kelvin functions

Created by:ChrisR

Tagsspecial functions,wave boundary layer,bessel functions

3

Solvers

71

大小

3

Solvers

71

大小

Problem 54355. Compute a determinant

Created by:ChrisR

Tagslarge numbers,sequence,determinant

4

Solvers

69

大小

4

Solvers

69

大小

Problem 54345. Fill a rectangle with 1x1 and 2x2 tiles

Created by:ChrisR

Tagstiles,sequence

5

Solvers

13

大小

5

Solvers

13

大小

Problem 54000. Solve an ODE: first-order linear equation

Created by:ChrisR

Tagsboundary value problem,differential equation,process not result

2

Solvers

67

大小

2

Solvers

67

大小

Problem 53995. Solve an ODE: nonlinear third-order equation

Created by:ChrisR

Tagsdifferential equations,boundary value problem,product rule

2

Solvers

122

大小

2

Solvers

122

大小

Problem 53990. Classify product/digit-sum sequences

Created by:ChrisR

Tagsnumber theory,sequence,noeis

6

Solvers

35

大小

6

Solvers

35

大小

Problem 53985. Check whether a Wordle guess is consistent with previous feedback

Created by:ChrisR

Tagsstrings,word games

7

Solvers

45

大小

7

Solvers

45

大小

Problem 53980. Determine whether a player solved a Cody problem

Created by:ChrisR

Tagsstrings,webread

3

Solvers

106

大小

3

Solvers

106

大小

Problem 53975. Compute the effective conductivity of more heterogeneous aquifers

Created by:ChrisR

Tagsgroundwater,conductivity,elliptic pde

1

Solver

400

大小

1

Solver

400

大小

Problem 53910. List the dopey numbers

Created by:ChrisR

Tagsbinary,number theory

5

Solvers

52

大小

5

Solvers

52

大小

Problem 53880. List the vile numbers

Created by:ChrisR

Tagsbinary,number theory,anagrams

6

Solvers

51

大小

6

Solvers

51

大小

Problem 53810. List the Beatriz numbers

Created by:ChrisR

Tagsprimes,number theory,sequence

4

Solvers

22

大小

4

Solvers

22

大小

Problem 53120. Compute the Sequence of the Day

Created by:ChrisR

Tagssequence

11

Solvers

21

大小

11

Solvers

21

大小

Problem 53004. Collect a set of candy wrappers

Created by:ChrisR

Tagssequences,probability,candy

3

Solvers

19

大小

3

Solvers

19

大小

Problem 52956. Compute the largest number whose prime factors sum to n

Created by:ChrisR

Tagsprimes,sequence,integer complexity

6

Solvers

26

大小

6

Solvers

26

大小

Problem 52881. List the cuban primes

Created by:ChrisR

Tagsprimes,project euler,sequence

7

Solvers

29

大小

7

Solvers

29

大小

Problem 52714. Multiply binary numbers

Created by:ChrisR

Tagsbinary,arithmetic,base 2

8

Solvers

62

大小

8

Solvers

62

大小

Problem 52669. Count the primes in Collatz sequences

Created by:ChrisR

Tagsprimes,sequence,another collatz problem

8

Solvers

54

大小

8

Solvers

54

大小

52664题。莫兰的数字列表

Created by:ChrisR

Tagsprimes,sequence,digit sum

6

Solvers

48

大小

6

Solvers

48

大小

Problem 52644. List modest numbers up to n

Created by:ChrisR

Tagssequence,divisibility

5

Solvers

66

大小

5

Solvers

66

大小

Problem 52639. Determine whether a number is unprimeable

Created by:ChrisR

Tagsprimes,project euler

9

Solvers

46

大小

9

Solvers

46

大小

Problem 52629. Count the ways to draw non-intersecting chords between points on a circle

Created by:ChrisR

Tagscombinatorics,geometry,sequence

4

Solvers

38

大小

4

Solvers

38

大小

52624题。Determine whether a number is a fibodiv number

Created by:ChrisR

Tagsstrings,fibonacci,sequence

7

Solvers

69

大小

7

Solvers

69

大小

Problem 52619. Find the nth nude number

Created by:ChrisR

Tagsdigits,sequence,divisibility

8

Solvers

30

大小

8

Solvers

30

大小

Problem 52288. List Honaker primes

Created by:ChrisR

Tagsprimes,digit sum

9

Solvers

38

大小

9

Solvers

38

大小

Problem 52283. Find numbers in the Popular Computing Z-sequence

Created by:ChrisR

Tagssequence

6

Solvers

46

大小

6

Solvers

46

大小

Problem 52183. List the nth prime quartet prefix

Created by:ChrisR

Tagsprimes,convolution,sequence

5

Solvers

55

大小

5

Solvers

55

大小

Problem 52125. Compute the sum of reciprocals of quadratics

Created by:ChrisR

Tagssum,special functions,analytical

7

Solvers

11

大小

7

Solvers

11

大小

Problem 52120. Compute the fractional derivative

Created by:ChrisR

Tagsspecial functions,fractional calculus

4

Solvers

41

大小

4

Solvers

41

大小

Problem 52110. Pick the die most likely to win

Created by:ChrisR

Tagsdice,probability,nontransitive

8

Solvers

23

大小

8

Solvers

23

大小

Problem 52085. Compute a sum involving the totient over divisors of a number

Created by:ChrisR

Tagssum,number theory,totient

5

Solvers

19

大小

5

Solvers

19

大小

Problem 52070. Compute the effective conductivity of a heterogeneous aquifer

Created by:ChrisR

Tagsgroundwater,darcy's law,conductivity

7

Solvers

17

大小

7

Solvers

17

大小

Problem 52060. Identify Ruth-Aaron numbers

Created by:ChrisR

Tagsnumber theory,baseball,factor sum

12

Solvers

43

大小

12

Solvers

43

大小

Problem 51975. Compute a sum of Ramanujan

Created by:ChrisR

Tagssum,special functions

8

Solvers

25

大小

8

Solvers

25

大小

Problem 51950. Find the smallest integer m such that n divides m!

Created by:ChrisR

Tagssequence,factorial,divisibility

6

Solvers

31

大小

6

Solvers

31

大小

Problem 51820. Count unique orderings of vertices of a polygon

Created by:ChrisR

Tagscombinatorics,permutations,sequence

11

Solvers

14

大小

11

Solvers

14

大小

Problem 51815. Solve an ODE: equation C

Created by:ChrisR

Tagsdifferential equations,boundary value problem,special functions

5

Solvers

39

大小

5

Solvers

39

大小

Problem 51813. Sum the elements in rows of the Levine triangle

Created by:ChrisR

Tagssequence,astronomical growth

4

Solvers

35

大小

4

Solvers

35

大小

1 – 50 of 157

Trial software