Cody

# Problems

1 – 50 of 67
 Problem Title Likes Solvers Difficulty

#### Problem 47798. Check if the input is a balanced prime

Created by: Mehmet OZC

1

18

#### Problem 44230. I'm going to enjoy watching you calculate, Mr Anderson

Created by: James

2

32

5

435

#### Problem 51798. Label primes with the Erdos-Selfridge classification

Created by: ChrisR

1

7

#### Problem 45388. Gapful numbers

Created by: Asif Newaz

1

14

#### Problem 51312. Count the square-full divisors of a number

Created by: ChrisR

0

6

#### Problem 47808. Check if the input is an interprime

Created by: Mehmet OZC

0

16

#### Problem 46016. Determine digits of the Copeland-Erdos constant

Created by: ChrisR

3

12

#### Problem 50182. Compute the Euler totient function

Created by: ChrisR

1

9

#### Problem 44289. Find two triangular numbers whose sum is input.

Created by: Mehmet OZC

2

77

#### Problem 45988. Evaluate the zeta function for real arguments > 1

Created by: ChrisR

1

14

#### Problem 46046. Determine whether a number is a cluster prime

Created by: ChrisR

4

14

#### Problem 46057. Find the last non-zero digit in a primorial

Created by: ChrisR

1

12

#### Problem 46060. Identify primorial primes

Created by: ChrisR

1

12

#### Problem 2593. Polite numbers. N-th polite number.

Created by: Jan Orwat

2

130

#### Problem 2733. Evil Number

Created by: Jan Orwat

3

218

#### Problem 52584. Easy Sequences 9: Faithful Pairs

Created by: Ramon Villamangca

0

5

#### Problem 44229. How brilliant are you?

Created by: James

3

39

#### Problem 44068. The number of trailing zero digit of a factorial

Created by: Jihye Sofia Seo

3

48

#### Problem 44319. Write c^3 as sum of two squares a^2+b^2

Created by: Mehmet OZC

2

293

#### Problem 46081. Set Soldner's constant

Created by: ChrisR

1

13

#### Problem 1771. Polygonal numbers

Created by: Jan Orwat

5

105

Created by: HH

3

15

#### Problem 42888. Frobenius McNugget Factorization

Created by: Ned Gulley

14

17

#### Problem 44065. Number of even divisors of a given number

Created by: Jihye Sofia Seo

2

36

#### Problem 45424. Amicable pair

Created by: Asif Newaz

2

6

#### Problem 45964. Compute the nth Pythagorean prime

Created by: ChrisR

0

17

#### Problem 1804. Fangs of a vampire number

Created by: Andrew Newell

4

71

#### Problem 656. Calculate Euler's phi function

Created by: Freddy

1

78

#### Problem 45342. Sieve of Eratosthenes

Created by: Asif Newaz

2

13

#### Problem 2734. N-th Odious

Created by: Jan Orwat

3

145

#### Problem 51715. Iterate the sum of divisors and totient

Created by: ChrisR

2

6

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

Created by: ChrisR

0

5

#### Problem 46003. Compute Khinchin's constant

Created by: ChrisR

2

11

#### Problem 46099. Identify full reptend primes

Created by: ChrisR

0

9

#### Problem 49788. Carmichael Number

Created by: Gifari Zulkarnaen

3

9

#### Problem 2797. modular arithmetic

Created by: rifat

2

38

#### Problem 2735. Binary Neighbourhood

Created by: Jan Orwat

2

57

#### Problem 52497. Easy Sequences 3: Prime 44-number Squares

Created by: Ramon Villamangca

1

8

#### Problem 2595. Polite numbers. Politeness.

Created by: Jan Orwat

6

123

#### Problem 49582. Determine whether a square can be drawn on a grid of dots

Created by: ChrisR

4

7

#### Problem 46087. Investigate the frequency of last non-zero digits of primorials

Created by: ChrisR

0

7

#### Problem 45994. Investigate the frequency of last digits of prime numbers

Created by: ChrisR

2

10

#### Problem 51565. Convert a number from base 10 to factorial notation

Created by: ChrisR

2

5

#### Problem 46066. Evaluate the logarithmic integral

Created by: ChrisR

1

12

#### Problem 46582. Find jumping medalists

Created by: ChrisR

3

12

#### Problem 53109. Easy Sequences 52: Non-squarable Rectangles

Created by: Ramon Villamangca

1

2

#### Problem 53119. Easy Sequences 53: Greatest Proper Divisor

Created by: Ramon Villamangca

1

2

#### Problem 2848. Digital Neighbourhood

Created by: Jan Orwat

2

49

#### Problem 42834. Integer complexity (Large numbers)

Created by: Peng Liu

1

11

1 – 50 of 67