# Problems

1 – 50 of 136
 Problem Title Likes Solvers Difficulty

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

Created by: Richard Zapor

1

20

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

Created by: Pisces

Tags primes

0

49

#### Problem 52298. Which Prime

Created by: Dyuman Joshi

Tags primes

1

35

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

Created by: Susan

Tags primes

3

31

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

Created by: Apurbo Roy Chowdhury

1

22

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

Created by: Huy

Tags primes, vector

0

67

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

Created by: ChrisR

4

27

#### Problem 2411. Largest Prime Number

Created by: Vinod Sudheesh

Tags primes

0

138

#### Problem 57600. Extract the prime numbers

Created by: Md. Ikrama Hossain

0

15

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

Created by: Mayank Bajpai

3

16

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

Created by: Manish Kapgate

Tags primes

0

93

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

Created by: AMITAVA BISWAS

Tags primes

1

68

#### Problem 50038. Number Puzzles - 014

Created by: Doddy Kastanya

Tags primes, puzzles

1

25

Created by: S AY

3

289

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

Created by: Mehmet OZC

1

22

#### Problem 57869. Identify de Polignac numbers

Created by: ChrisR

2

11

0

9

#### Problem 59064. Sum the prime numbers from 1-100

Created by: Jacob

Tags primes

0

8

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

Created by: Loris Chavée

2

35

#### Problem 42513. Is it prime?

Created by: Azhar

5

136

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

Created by: Jesús Zambrano

Tags primes, ratio

1

35

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

Created by: ChrisR

1

19

#### Problem 56260. Leonardo primes

Created by: Lenka Hanakova

3

18

#### Problem 42749. Find the nearest prime

Created by: Pooja Narayan

Tags math, primes

1

96

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

Created by: Richard Zapor

1

52

#### Problem 248. Twins in a Window

Created by: Ned Gulley

Tags primes

2

147

#### Problem 43269. Get all prime factors

Created by: Jamil Kasan

6

576

#### Problem 52293. Palindromic Primes

Created by: Dyuman Joshi

3

17

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

Created by: Jesús Zambrano

0

29

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

Created by: Mehmet OZC

2

27

#### Problem 3020. Prime Letters = Removing

Created by: Gareth Thomas

Tags primes

0

88

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

Created by: ChrisR

1

18

#### Problem 42704. prime to each other

Created by: George-Felix Leu

Tags primes

1

55

#### Problem 46624. List the emirps

Created by: ChrisR

2

39

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

Created by: Said BOUREZG

Tags primes

1

22

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

Created by: Mehmet OZC

1

21

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

Created by: ChrisR

1

10

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

Created by: Said BOUREZG

Tags primes

2

29

#### Problem 43085. Primes Checker

Created by: Jamil Kasan

8

58

#### Problem 1298. P-smooth numbers

Created by: Richard Zapor

Tags primes, find, mod

1

81

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

Created by: ChrisR

1

9

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

Created by: Asif Newaz

2

17

#### Problem 50948. Identify prime words

Created by: ChrisR

Tags primes, strings

2

14

#### Problem 51720. Hoax Numbers

Created by: Dyuman Joshi

Tags primes, numbers

3

15

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

Created by: ChrisR

4

16

#### Problem 46060. Identify primorial primes

Created by: ChrisR

1

14

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

Created by: ChrisR

1

14

#### Problem 54755. List odd twin composites

Created by: ChrisR

1

5

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

Created by: ChrisR

2

12

1 – 50 of 136