Cody

Problems

101 – 142 of 142
Problem Title
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Solvers
Difficulty

Problem 54755. List odd twin composites

Created by: ChrisR

Tags primes, number theory, sequence

1

3

Problem 48040. Find the Pattern 5

Created by: Doddy Kastanya

Tags logic, sequence, pattern

0

53

Problem 45343. How lucky r u ?

Created by: Asif Newaz

Tags number, sequence, lucky

2

12

Problem 52881. List the cuban primes

Created by: ChrisR

Tags primes, project euler, sequence

1

7

Problem 44732. Highly divisible triangular number (inspired by Project Euler 12)

Created by: goc3

Tags series, triangle, projecteuler

1

73

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

Created by: ChrisR

Tags combinatorics, geometry, sequence

0

4

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

Created by: ChrisR

Tags tiles, sequence

1

5

Problem 51241. Compute home primes in a given base

Created by: ChrisR

Tags primes, sequence, base conversion

0

6

Problem 52183. List the nth prime quartet prefix

Created by: ChrisR

Tags primes, convolution, sequence

0

5

Problem 47518. Play Outside In with primes

Created by: ChrisR

Tags primes, puzzle, sequence

0

6

Problem 45423. Bernoulli's Triangle

Created by: Asif Newaz

Tags easy, sequence

1

14

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

Created by: ChrisR

Tags sequence, factorial, divisibility

1

8

Problem 48075. Play PRIMEGAME

Created by: ChrisR

Tags primes, sequence, conway

2

8

Problem 52669. Count the primes in Collatz sequences

Created by: ChrisR

Tags primes, sequence, another collatz problem

1

8

Problem 47073. Find the nth Fibbinary number

Created by: ChrisR

Tags binary, fibonacci, sequence

2

10

Problem 47895. List the dihedral primes

Created by: ChrisR

Tags primes, sequence, symmetry

2

9

Problem 52522. Easy Sequences 4: Eliminate the Days of Confusion

Created by: Ramon Villamangca

Tags easy, sequence, date and time

2

13

Problem 2190. Order of things - 2

Created by: J-G van der Toorn

Tags matrix, sequence, algorithm

2

10

Problem 45473. Sub-sequence - 01

Created by: Asif Newaz

Tags sequence

0

5

Problem 51077. List composite numbers that cannot be written as the sum of two primes

Created by: ChrisR

Tags primes, number theory, sequence

2

7

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

Created by: ChrisR

Tags sequence, interesting plot

1

3

Problem 54780. Trap a knight

Created by: ChrisR

Tags spiral, chess, sequence

0

2

Problem 53990. Classify product/digit-sum sequences

Created by: ChrisR

Tags number theory, sequence, noeis

2

6

Problem 54355. Compute a determinant

Created by: ChrisR

Tags large numbers, sequence, determinant

0

4

Problem 54620. List the Euclid numbers

Created by: ChrisR

Tags primes, sequence, infinitude

0

5

Problem 54645. Determine whether the input is an anagram number

Created by: ChrisR

Tags sequence, anagram, wordplay

0

4

Problem 54660. Generate the Figure-Figure sequence

Created by: ChrisR

Tags sequence, figure/ground, hofstadter

2

5

Problem 54680. Determine whether a number is practical

Created by: ChrisR

Tags factors, number theory, sequence

2

4

Problem 45272. Pseudo-vampire number

Created by: Asif Newaz

Tags numbers, number theory, sequence

2

19

Problem 53810. List the Beatriz numbers

Created by: ChrisR

Tags primes, number theory, sequence

2

4

Problem 2672. Largest Geometric Series

Created by: rifat

Tags matrix manipulation, sequence, vectr

3

56

Problem 52769. Easy Sequences 22: Sum of Proper Fractions

Created by: Ramon Villamangca

Tags easy, number theory, sequence

1

5

Problem 52644. List modest numbers up to n

Created by: ChrisR

Tags sequence, divisibility

3

5

Problem 52664. List the Moran numbers

Created by: ChrisR

Tags primes, sequence, digit sum

3

6

Problem 45474. Sub-sequence - 02

Created by: Asif Newaz

Tags sequence

0

4

Problem 45475. Sub-sequence - 03

Created by: Asif Newaz

Tags sequence

1

4

Problem 52659. Easy Sequences 15: Pythagorean Area with maximum Hypotenuse

Created by: Ramon Villamangca

Tags easy, geometry, number theory

1

4

Problem 1506. Maximum Intra-Vector Swaps

Created by: Richard Zapor

Tags vector, contest, uint8

0

7

Problem 2191. Order of things - 3

Created by: J-G van der Toorn

Tags matrix, algorithms, sequence

0

1

Problem 2192. Order of things - 4

Created by: J-G van der Toorn

Tags matrix, algorithms, sequence

0

2

Problem 45321. Kolakoski Sequence

Created by: Asif Newaz

Tags sequence, kolakoski

1

5

Problem 44784. Project Euler: Problem 14 Longest Collatz sequence(harder version)

Created by: Binbin Qi

Tags speed optimization, sequence, euler

1

3
101 – 142 of 142