Rafael S.T. Vieira

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Problem 49738. Determine whether a prime is Pythagorean

Created by: ChrisR

Tags primes, pythagoras, number theory

1

Solution

36

Size

1

Solution

36

Size

Problem 45964. Compute the nth Pythagorean prime

Created by: ChrisR

Tags primes, pythagoras, number theory

2

Solutions

70

Size

2

Solutions

70

Size

Problem 45463. Word Ladder

Created by: Asif Newaz

Tags ladder, algorithm

1

Solution

410

Size

1

Solution

410

Size

Problem 45321. Kolakoski Sequence

Created by: Asif Newaz

Tags sequence, kolakoski

1

Solution

112

Size

1

Solution

112

Size

Problem 45449. Quarantine Days

Created by: Asif Newaz

Tags table

4

Solutions

127

Size

4

Solutions

127

Size

Problem 45475. Sub-sequence - 03

Created by: Asif Newaz

Tags sequence

2

Solutions

174

Size

2

Solutions

174

Size

Problem 45474. Sub-sequence - 02

Created by: Asif Newaz

Tags sequence

1

Solution

130

Size

1

Solution

130

Size

Problem 45473. Sub-sequence - 01

Created by: Asif Newaz

Tags sequence

1

Solution

61

Size

1

Solution

61

Size

Problem 45426. The Tortoise and the Hare - 02

Created by: Asif Newaz

Tags algorithm

1

Solution

64

Size

1

Solution

64

Size

Problem 45422. Coin Distribution - 02

Created by: Asif Newaz

Tags algorithm

2

Solutions

132

Size

2

Solutions

132

Size

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

Created by: ChrisR

Tags combinatorics, geometry, sequence

1

Solution

62

Size

1

Solution

62

Size

Problem 52060. Identify Ruth-Aaron numbers

Created by: ChrisR

Tags number theory, baseball, factor sum

2

Solutions

71

Size

2

Solutions

71

Size

Problem 51715. Iterate the sum of divisors and totient

Created by: ChrisR

Tags number theory, sequence, divisors

1

Solution

188

Size

1

Solution

188

Size

Problem 52644. List modest numbers up to n

Created by: ChrisR

Tags sequence, divisibility

2

Solutions

78

Size

2

Solutions

78

Size

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

Created by: ChrisR

Tags sequence

5

Solutions

56

Size

5

Solutions

56

Size

Problem 52624. Determine whether a number is a fibodiv number

Created by: ChrisR

Tags strings, fibonacci, sequence

2

Solutions

100

Size

2

Solutions

100

Size

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

Created by: ChrisR

Tags tiles, sequence

1

Solution

32

Size

1

Solution

32

Size

Problem 53990. Classify product/digit-sum sequences

Created by: ChrisR

Tags number theory, sequence, noeis

1

Solution

90

Size

1

Solution

90

Size

Problem 53120. Compute the Sequence of the Day

Created by: ChrisR

Tags sequence

2

Solutions

16

Size

2

Solutions

16

Size

Problem 53910. List the dopey numbers

Created by: ChrisR

Tags binary, number theory

3

Solutions

109

Size

3

Solutions

109

Size

Problem 53880. List the vile numbers

Created by: ChrisR

Tags binary, number theory, anagrams

1

Solution

109

Size

1

Solution

109

Size

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

Created by: ChrisR

Tags sequence, astronomical growth

1

Solution

44

Size

1

Solution

44

Size

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

Created by: ChrisR

Tags sequence, factorial, divisibility

2

Solutions

89

Size

2

Solutions

89

Size

Problem 52619. Find the nth nude number

Created by: ChrisR

Tags digits, sequence, divisibility

6

Solutions

39

Size

6

Solutions

39

Size

Problem 52764. Easy Sequences 24: Number of Coprime Lattice Points

Created by: Ramon Villamangca

Tags easy, geometry, number theory

1

Solution

163

Size

1

Solution

163

Size

Problem 52814. Easy Sequences 27: Product of Radicals of Integers

Created by: Ramon Villamangca

Tags easy, number theory, simple

4

Solutions

32

Size

4

Solutions

32

Size

Problem 52809. Easy Sequences 28: Sum of Radicals of Integers

Created by: Ramon Villamangca

Tags easy, number theory, simple

3

Solutions

41

Size

3

Solutions

41

Size

Problem 52824. Easy Sequences 31: N-N's Sequence

Created by: Ramon Villamangca

Tags easy, simple, sequence

1

Solution

20

Size

1

Solution

20

Size

Problem 52779. Easy Sequences 25: Product of Series

Created by: Ramon Villamangca

Tags easy, series, simple

2

Solutions

14

Size

2

Solutions

14

Size

Problem 52729. Easy Sequences 21: Combinatorial Summations

Created by: Ramon Villamangca

Tags easy, combinatorics, number theory

3

Solutions

254

Size

3

Solutions

254

Size

Problem 52689. Easy Sequences 18: Set Bits of Triple Summations

Created by: Ramon Villamangca

Tags easy, sequences, binary

5

Solutions

30

Size

5

Solutions

30

Size

Problem 52679. Easy Sequences 16: Volume of Embedded Octahedron

Created by: Ramon Villamangca

Tags easy, geometry, number theory

1

Solution

62

Size

1

Solution

62

Size

Problem 52654. Easy Sequences 13: Average Speed of Spaceship

Created by: Ramon Villamangca

Tags easy, sequences, physics

7

Solutions

20

Size

7

Solutions

20

Size

Problem 51246. Characterize the final state of another digit inventory sequence

Created by: ChrisR

Tags counting, sequence, digit inventory sequence

1

Solution

228

Size

1

Solution

228

Size

Problem 50913. Compute the nth term from the golden sieve

Created by: ChrisR

Tags sequence, sieve

1

Solution

29

Size

1

Solution

29

Size

Problem 50811. Compute the nth term from the Sieve of Flavius Josephus

Created by: ChrisR

Tags sequence, sieve

1

Solution

51

Size

1

Solution

51

Size

Problem 49803. Compute expulsions from the Kimberling shuffle

Created by: ChrisR

Tags sequences

2

Solutions

66

Size

2

Solutions

66

Size

Problem 51282. Compute a row of the Kimberling shuffle

Created by: ChrisR

Tags sequences

5

Solutions

116

Size

5

Solutions

116

Size

Problem 49572. Compute the largest number possible with the Brussels choice

Created by: ChrisR

Tags strings, sequence, greedy

3

Solutions

130

Size

3

Solutions

130

Size

Problem 51768. Redefine the Array if the Elements in the Array are Repeating

Created by: Sambit Supriya Dash

Tags repetition, poor_test_suite, poor_problem_statement

1

Solution

108

Size

1

Solution

108

Size

Problem 56623. Acid-Base Chemistry: Which side of the reaction is more favorable?

Created by: Christian

Tags easy, chemistry, reactions

3

Solutions

42

Size

3

Solutions

42

Size

Problem 46034. Construct the Seidel-Entringer-Arnold triangle

Created by: ChrisR

Tags math, tangent, matrix pattern

1

Solution

74

Size

1

Solution

74

Size

Problem 49808. Identify eban numbers

Created by: ChrisR

Tags strings, sequence

7

Solutions

94

Size

7

Solutions

94

Size

Problem 51002. Deduce the pattern behind the sequence

Created by: ChrisR

Tags sequence

2

Solutions

14

Size

2

Solutions

14

Size

Problem 48920. Cipher and Decipher the message - 3 key

Created by: Sibi

Tags cipher, dicipher

4

Solutions

83

Size

4

Solutions

83

Size

Problem 48270. Decipher the message - same key for all digits

Created by: Sibi

Tags dicipher

6

Solutions

16

Size

6

Solutions

16

Size

Problem 47970. Cipher or decipher the number according to the second input - 10 keys

Created by: Sibi

Tags cipher, decipher

2

Solutions

189

Size

2

Solutions

189

Size

Problem 48175. Cipher or Decipher the number according to the second input - 3 keys - order [1 2 3 2 1 2 3 ......]

Created by: Sibi

Tags cipher, dichiper

2

Solutions

136

Size

2

Solutions

136

Size

Problem 47813. Cipher or Decipher the number according to the second input - 3 keys

Created by: Sibi

Tags cipher, decipher

1

Solution

134

Size

1

Solution

134

Size

Problem 47603. Cipher or Decipher the number according to the second input - 1 key for all digits

Created by: Sibi

Tags cipher, decipher

1

Solution

105

Size

1

Solution

105

Size

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