Cody

# Problems

51 – 92 of 92
 Problem Title Likes Solvers Difficulty

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

Created by: ChrisR

0

5

#### Problem 46099. Identify full reptend primes

Created by: ChrisR

0

9

#### Problem 42888. Frobenius McNugget Factorization

Created by: Ned Gulley

14

16

#### Problem 45342. Sieve of Eratosthenes

Created by: Asif Newaz

2

12

#### Problem 45424. Amicable pair

Created by: Asif Newaz

2

5

#### Problem 2797. modular arithmetic

Created by: rifat

2

37

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

Created by: ChrisR

2

10

#### Problem 2735. Binary Neighbourhood

Created by: Jan Orwat

2

55

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

Created by: ChrisR

1

5

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

Created by: Jan Orwat

6

121

#### Problem 49788. Carmichael Number

Created by: Gifari Zulkarnaen

3

8

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

Created by: ChrisR

2

10

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

Created by: ChrisR

0

7

#### Problem 52609. Easy Sequences 11: Factorial Digits without Trailing Zeros

Created by: Ramon Villamangca

0

4

#### Problem 45939. Estimate π from certain values of the zeta function

Created by: ChrisR

0

6

#### Problem 46066. Evaluate the logarithmic integral

Created by: ChrisR

1

12

#### Problem 2848. Digital Neighbourhood

Created by: Jan Orwat

2

48

#### Problem 45831. Compute the Bernoulli numbers

Created by: ChrisR

0

8

#### Problem 42889. Should Mr McNugget even get out of bed today?

Created by: James

1

11

#### Problem 45272. Pseudo-vampire number

Created by: Asif Newaz

2

18

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

Created by: ChrisR

4

6

#### Problem 52614. Easy Sequences 12: 50th Prime

Created by: Ramon Villamangca

0

3

#### Problem 52634. Easy Sequences 14: Consecutive Composites

Created by: Ramon Villamangca

0

1

#### Problem 52679. Easy Sequences 16: Volume of Embedded Octahedron

Created by: Ramon Villamangca

1

3

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

Created by: ChrisR

2

7

#### Problem 46582. Find jumping medalists

Created by: ChrisR

3

12

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

Created by: ChrisR

2

5

#### Problem 1825. Find all vampire fangs

Created by: Andrew Newell

2

50

#### Problem 45997. Evaluate the zeta function for complex arguments

Created by: ChrisR

0

8

#### Problem 1826. Find vampire numbers

Created by: Andrew Newell

9

248

#### Problem 52724. Easy Sequences 20: Counting Prime-sided Rectangles

Created by: Ramon Villamangca

Tags easy, geometry, area

1

3

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

Created by: Peng Liu

1

10

#### Problem 45274. Fangs of pseudo-vampire number

Created by: Asif Newaz

1

15

#### Problem 52709. Easy Sequences 19: Length of Prime-sided Rectangle with Maximum Area

Created by: Ramon Villamangca

Tags easy, geometry, area

1

3

#### Problem 2160. The 17x17 Problem

Created by: Ned Gulley

1

7

#### Problem 44788. Find the right number make the equation

Created by: Binbin Qi

2

9

#### Problem 52567. Easy Sequences 7: Easy as Composite Pi

Created by: Ramon Villamangca

0

2

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

Created by: Ramon Villamangca

1

3

#### Problem 52684. Easy Sequences 17: Mu Variant Function

Created by: Ramon Villamangca

0

2

#### Problem 51580. Construct a continued fraction for a square root

Created by: ChrisR

2

4

#### Problem 52729. Easy Sequences 21: Combinatorial Summations

Created by: Ramon Villamangca

1

1

#### Problem 2737. Prouhet–Tarry–Escott (basic)

Created by: Jan Orwat

0

7

51 – 92 of 92