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Problem 58498. Compute the Sisyphus sequence

Created by: ChrisR

Tags primes, sequence, mythology

1

Solution

100

Size

1

Solution

100

Size

Problem 60581. List primes of the form xy+z

Created by: ChrisR

Tags primes, number theory, sequence

1

Solution

38

Size

1

Solution

38

Size

Problem 59836. Determine whether a number is a Gaussian prime

Created by: ChrisR

Tags primes, mod, complex

2

Solutions

40

Size

2

Solutions

40

Size

Problem 59701. Express numbers as the sum of a prime, a square, and a cube

Created by: ChrisR

Tags primes, puzzle, partitions

1

Solution

43

Size

1

Solution

43

Size

Problem 59170. Determine whether a number is a Zeisel number

Created by: ChrisR

Tags primes, sequence, recurrence

1

Solution

71

Size

1

Solution

71

Size

Problem 59126. Compute the bubble popper fidget spinner sequence

Created by: ChrisR

Tags binary, sequence, modulo

2

Solutions

35

Size

2

Solutions

35

Size

Problem 58019. Factor a number into Fermi-Dirac primes

Created by: ChrisR

Tags primes, number theory

1

Solution

36

Size

1

Solution

36

Size

Problem 58018. List the Fermi-Dirac primes

Created by: ChrisR

Tags primes, number theory

1

Solution

23

Size

1

Solution

23

Size

Problem 57869. Identify de Polignac numbers

Created by: ChrisR

Tags primes, number theory, sequence

1

Solution

21

Size

1

Solution

21

Size

Problem 57815. List numbers such that every sum of consecutive positive integers ending in those numbers is composite

Created by: ChrisR

Tags primes, sequence, triangular

1

Solution

28

Size

1

Solution

28

Size

Problem 57810. List the two-bit primes

Created by: ChrisR

Tags primes, strings, puzzle

2

Solutions

62

Size

2

Solutions

62

Size

Problem 57477. Solve an equation involving primes and fractions

Created by: ChrisR

Tags primes, number theory, sequence

2

Solutions

62

Size

2

Solutions

62

Size

Problem 55275. List the semiprimes

Created by: ChrisR

Tags primes, number theory, sequence

2

Solutions

13

Size

2

Solutions

13

Size

Problem 54755. List odd twin composites

Created by: ChrisR

Tags primes, number theory, sequence

1

Solution

35

Size

1

Solution

35

Size

Problem 53810. List the Beatriz numbers

Created by: ChrisR

Tags primes, number theory, sequence

1

Solution

21

Size

1

Solution

21

Size

Problem 54620. List the Euclid numbers

Created by: ChrisR

Tags primes, sequence, infinitude

1

Solution

75

Size

1

Solution

75

Size

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

Created by: ChrisR

Tags primes, sequence, integer complexity

2

Solutions

14

Size

2

Solutions

14

Size

Problem 52881. List the cuban primes

Created by: ChrisR

Tags primes, project euler, sequence

2

Solutions

13

Size

2

Solutions

13

Size

Problem 52664. List the Moran numbers

Created by: ChrisR

Tags primes, speed, sequence

3

Solutions

15

Size

3

Solutions

15

Size

Problem 2487. Create Combination

Created by: rifat

Tags nchoosek

1

Solution

40

Size

1

Solution

40

Size

Problem 1855. Usage of java.math : N Choose K with unlimited precision

Created by: Richard Zapor

Tags nchoosek, java, bigdecimal

2

Solutions

38

Size

2

Solutions

38

Size

Problem 1889. Get ranking of a combination looking for speed.

Created by: Doug Hull

Tags speed

2

Solutions

39

Size

2

Solutions

39

Size

Problem 1888. Get ranking of a combination

Created by: Doug Hull

Tags combinations, speed optimization, lexicographic order

2

Solutions

19

Size

2

Solutions

19

Size

Problem 1517. Put m balls into n boxes (again)

Created by: Binbin Qi

Tags nchoosek

1

Solution

49

Size

1

Solution

49

Size

Problem 1516. Put m balls into n boxes

Created by: Binbin Qi

Tags perms nchoosek unique

1

Solution

22

Size

1

Solution

22

Size

Problem 1388. Numbered lottery balls into cells

Created by: James

Tags permutations, lottery, buckets

2

Solutions

35

Size

2

Solutions

35

Size

Problem 1393. A (wrong) place for everything, and everything in its (wrong) place

Created by: James

Tags permutations, organization

1

Solution

14

Size

1

Solution

14

Size

Problem 1147. Possible Outcomes of American Roulette

Created by: Robert Turner

Tags gamble, payout, odds

2

Solutions

26

Size

2

Solutions

26

Size

Problem 44241. NCHOOSEK - Time Optimization

Created by: LY Cao

Tags combinations, speed optimization

1

Solution

2

Size

1

Solution

2

Size

Problem 793. Combinations without using nchoosek

Created by: Aurelien Queffurust

Tags nchoosek, combinations

1

Solution

28

Size

1

Solution

28

Size

Problem 42494. Which permutation is it?

Created by: Jan Orwat

Tags indexing, permutations

1

Solution

36

Size

1

Solution

36

Size

Problem 42495. N-th permutation.

Created by: Jan Orwat

Tags indexing, permutations

2

Solutions

51

Size

2

Solutions

51

Size

Problem 1215. Diophantine Equations (Inspired by Project Euler, problem 66)

Created by: James

Tags projecteuler, diophantine, pell equation

1

Solution

158

Size

1

Solution

158

Size

Problem 1891. High Precision Square Root (Inspired by Project Euler 80)

Created by: James

Tags projecteuler, square root

1

Solution

62

Size

1

Solution

62

Size

Problem 2606. Decrypt the cypher using XOR encryption (for beginners)

Created by: Jean-Marie Sainthillier

Tags xor, projecteuler, encryption

1

Solution

30

Size

1

Solution

30

Size

Problem 1106. I've got the power! (Inspired by Project Euler problem 29)

Created by: James

Tags projecteuler, powers, snap!

1

Solution

31

Size

1

Solution

31

Size

Problem 577. Repopulate the City

Created by: Ned Gulley

Tags factors

1

Solution

25

Size

1

Solution

25

Size

Problem 57472. Compute the Lagarias Riemann Hypothesis sequence

Created by: ChrisR

Tags number theory, millennium problem, sloanes hateful eight

3

Solutions

51

Size

3

Solutions

51

Size

Problem 57293. Compute the unitary totient of a number

Created by: ChrisR

Tags number theory, sequence

1

Solution

28

Size

1

Solution

28

Size

Problem 56593. List the nth term of Rozhenko’s inventory sequence

Created by: ChrisR

Tags sequence, inventory, numberphile

1

Solution

44

Size

1

Solution

44

Size

Problem 55280. Count estrangements

Created by: ChrisR

Tags permutations, arrangements, partner

1

Solution

65

Size

1

Solution

65

Size

Problem 54780. Trap a knight

Created by: ChrisR

Tags spiral, chess, sequence

1

Solution

57

Size

1

Solution

57

Size

Problem 57492. Compute the Tetris sequence

Created by: ChrisR

Tags binary, sequence, facial recognition

1

Solution

35

Size

1

Solution

35

Size

Problem 54775. Flip the parity of digits in a decimal expansion

Created by: ChrisR

Tags sequence, interesting plot

1

Solution

55

Size

1

Solution

55

Size

Problem 57487. Compute the largest number with a given integer complexity

Created by: ChrisR

Tags number theory, sequence

1

Solution

105

Size

1

Solution

105

Size

Problem 57288. Sum the unitary divisors of a number

Created by: ChrisR

Tags number theory, sequence

1

Solution

25

Size

1

Solution

25

Size

Problem 56743. Count the unitary divisors of a number

Created by: ChrisR

Tags number theory, sequence

1

Solution

16

Size

1

Solution

16

Size

Problem 56240. List numbers that are not squares

Created by: ChrisR

Tags sequence, annoying bans, you know where to look

1

Solution

26

Size

1

Solution

26

Size

Problem 54770. Count the peaceful queens

Created by: ChrisR

Tags chess, sequence, oblong

1

Solution

13

Size

1

Solution

13

Size

Problem 54660. Generate the Figure-Figure sequence

Created by: ChrisR

Tags sequence, figure/ground, hofstadter

1

Solution

52

Size

1

Solution

52

Size

1 – 50 of 654