# Problems

1 – 50 of 123
 Problem Title Likes Solvers Difficulty

#### Problem 1763. Primes for Large N: 2^30, System Memory Limit

Created by: Richard Zapor

1

17

#### Problem 55170. Find all prime factors of the input

Created by: Pisces

Tags primes

0

27

#### Problem 52298. Which Prime

Created by: Dyuman Joshi

Tags primes

1

31

#### Problem 1761. Primes Faster for Large N

Created by: Richard Zapor

1

34

#### Problem 54900. Find the number of primes less than input

Created by: Susan

Tags primes

3

27

#### Problem 42483. Give prime Numbers upto n

Created by: Manish Kapgate

Tags primes

0

87

#### Problem 52397. Find the nth composite number.

Created by: Apurbo Roy Chowdhury

1

20

#### Problem 2335. Find the number that has most primes those less than it

Created by: Huy

Tags primes, vector

0

65

#### Problem 47803. Check if the input is a strong prime

Created by: Mehmet OZC

1

20

#### Problem 46054. Count trailing zeros in a primorial

Created by: ChrisR

3

23

#### Problem 2411. Largest Prime Number

Created by: Vinod Sudheesh

Tags primes

0

132

#### Problem 44266. Sort the prime numbers in each row of a matrix

Created by: Loris Chavée

2

34

#### Problem 46848. Modulo of sum of square of first n primes with 24

Created by: Mayank Bajpai

3

14

#### Problem 49738. Determine whether a prime is Pythagorean

Created by: ChrisR

0

14

Created by: S AY

3

281

#### Problem 44284. Given a number N, find the smallest prime P>N

Created by: AMITAVA BISWAS

Tags primes

1

62

#### Problem 50038. Number Puzzles - 014

Created by: Doddy Kastanya

Tags primes, puzzles

1

23

#### Problem 42513. Is it prime?

Created by: Azhar

5

130

0

9

#### Problem 42749. Find the nearest prime

Created by: Pooja Narayan

Tags math, primes

1

76

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

Created by: Mehmet OZC

2

24

#### Problem 44861. Ratio between sums of prime and non-prime numbers

Created by: Jesús Zambrano

Tags primes, ratio

1

34

#### Problem 42704. prime to each other

Created by: George-Felix Leu

Tags primes

1

55

#### Problem 43269. Get all prime factors

Created by: Jamil Kasan

6

477

#### Problem 896. Sophie Germain prime

Created by: Aurelien Queffurust

3

461

#### Problem 56260. Leonardo primes

Created by: Lenka Hanakova

3

13

#### Problem 52293. Palindromic Primes

Created by: Dyuman Joshi

3

13

#### Problem 51466. List prime anagrams of a number

Created by: ChrisR

1

16

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

Created by: Mehmet OZC

1

18

#### Problem 3020. Prime Letters = Removing

Created by: Gareth Thomas

Tags primes

0

83

#### Problem 50933. Find pairs of primes with the same digit sum

Created by: ChrisR

1

10

#### Problem 44862. Ratio between sum of primes and sum of factors

Created by: Jesús Zambrano

0

27

#### Problem 43085. Primes Checker

Created by: Jamil Kasan

8

56

#### Problem 248. Twins in a Window

Created by: Ned Gulley

Tags primes

2

136

#### Problem 45367. Sieve of Eratosthenes - 02

Created by: Asif Newaz

1

14

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

Created by: ChrisR

1

13

#### Problem 44098. Find my secret function I

Created by: Said BOUREZG

Tags primes

2

29

#### Problem 46111. Evaluate the prime zeta function

Created by: ChrisR

1

13

#### Problem 46624. List the emirps

Created by: ChrisR

2

34

#### Problem 49733. Solve the arithmetic differential equation D(n) = n

Created by: ChrisR

0

7

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

Created by: ChrisR

1

9

#### Problem 50948. Identify prime words

Created by: ChrisR

Tags primes, strings

2

12

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

Created by: ChrisR

1

9

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

Created by: ChrisR

4

14

#### Problem 1298. P-smooth numbers

Created by: Richard Zapor

Tags primes, find, mod

1

72

#### Problem 44099. Find my secret function II

Created by: Said BOUREZG

Tags primes

1

21

#### Problem 54755. List odd twin composites

Created by: ChrisR

1

5

Created by: HH

1

5

#### Problem 51198. Find pairs of primes with the same digit sum and a specified separation

Created by: ChrisR

1

10

1 – 50 of 123