Cody

Problems

1 – 50 of 74
Problem Title
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Difficulty

Problem 42749. Find the nearest prime

Created by: Pooja Narayan

Tags math, primes

1

61

Problem 896. Sophie Germain prime

Created by: Aurelien Queffurust

Tags prime, primes, sophie germain

3

441

Problem 47798. Check if the input is a balanced prime

Created by: Mehmet OZC

Tags primes, number theory, balanced prime

1

18

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

Created by: ChrisR

Tags primes, digit sum

1

8

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

Created by: ChrisR

Tags primes, sequence, digit sum

1

8

Problem 51798. Label primes with the Erdos-Selfridge classification

Created by: ChrisR

Tags primes, number theory, guy a18

1

8

Problem 52293. Palindromic Prime

Created by: Dyuman Joshi

Tags primes, palindrome

3

11

Problem 248. Twins in a Window

Created by: Ned Gulley

Tags primes

2

135

Problem 46624. List the emirps

Created by: ChrisR

Tags sequences, primes

2

31

Problem 3020. Prime Letters = Removing

Created by: Gareth Thomas

Tags primes

0

77

Problem 47808. Check if the input is an interprime

Created by: Mehmet OZC

Tags primes, number theory, interprime

0

16

Problem 50182. Compute the Euler totient function

Created by: ChrisR

Tags primes, number theory

1

9

Problem 45367. Sieve of Eratosthenes - 02

Created by: Asif Newaz

Tags primes, sequence, algorithm

1

14

Problem 43085. Primes Checker

Created by: Jamil Kasan

Tags primes, variable input

8

52

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

Created by: ChrisR

Tags primes, number theory, primorial

1

13

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

Created by: Jesús Zambrano

Tags primes, factors, ratio

0

26

Problem 1298. P-smooth numbers

Created by: Richard Zapor

Tags primes, find, mod

1

66

Problem 52288. List Honaker primes

Created by: ChrisR

Tags primes, digit sum

2

9

Problem 46046. Determine whether a number is a cluster prime

Created by: ChrisR

Tags primes, number theory

4

14

Problem 51720. Hoax Numbers

Created by: Dyuman Joshi

Tags primes, numbers

3

13

Problem 44099. Find my secret function II

Created by: Said BOUREZG

Tags primes

1

21

Problem 47843. Compute the arithmetic derivative of integers

Created by: ChrisR

Tags primes, integers, arithmetic derivative

0

15

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

Created by: ChrisR

Tags primes, number theory, sequence

0

7

Problem 46111. Evaluate the prime zeta function

Created by: ChrisR

Tags primes, zeta function

1

11

Problem 50948. Identify prime words

Created by: ChrisR

Tags primes, strings

2

9

Problem 46060. Identify primorial primes

Created by: ChrisR

Tags primes, number theory, primorial

1

13

Problem 52639. Determine whether a number is unprimeable

Created by: ChrisR

Tags primes, project euler

3

9

Problem 47950. Test the generalized Legendre conjecture

Created by: ChrisR

Tags primes, conjecture

0

10

Problem 2337. Sum of big primes without primes

Created by: Jean-Marie Sainthillier

Tags primes, project euler, eratosthenes

1

137

Problem 1096. Largest Twin Primes

Created by: Des Mc Manus

Tags primes

2

380

Problem 47793. Find the smallest prime with n inside

Created by: ChrisR

Tags primes, strings, sequence

2

13

Problem 45964. Compute the nth Pythagorean prime

Created by: ChrisR

Tags primes, pythagoras, number theory

0

19

Problem 44849. Given a base n, find the y values less or equal than 100(without 1), such that they will never produce a periodic number if we divide any whole number between some of them

Created by: Fabio Squizzato

Tags primes, linear algebra, basic matlab

1

9

Problem 52956. Compute the largest number whose prime factors sum to n

Created by: ChrisR

Tags primes, sequence, integer complexity

1

6

Problem 44305. 5 Prime Numbers

Created by: goc3

Tags prime, primes, string

7

421

Problem 46047. Identify Wagstaff primes

Created by: ChrisR

Tags primes

2

23

Problem 43087. Move if I am Optimus Prime

Created by: Jamil Kasan

Tags primes, jokes

8

32

Problem 241. Project Euler: Problem 7, Nth prime

Created by: Doug Hull

Tags primes, projecteuler

14

980

Problem 2340. Numbers spiral diagonals (Part 1)

Created by: Jean-Marie Sainthillier

Tags primes, project euler, spiral

2

137

Problem 1697. Make a Pandiagonal Prime Magic Square: 11 x 11

Created by: Richard Zapor

Tags primes, magic square, pandiagonal

2

10

Problem 46594. Create a sequence of primes p such that p > n π(p)

Created by: ChrisR

Tags primes, sequence

1

9

Problem 2910. Mersenne Primes vs. All Primes

Created by: goc3

Tags primes, comparison, powers

4

329

Problem 52584. Easy Sequences 9: Faithful Pairs

Created by: Ramon Villamangca

Tags easy, sequences, primes

0

10

Problem 47833. List the delete-a-digit primes

Created by: ChrisR

Tags sequences, primes

3

15

Problem 46099. Identify full reptend primes

Created by: ChrisR

Tags primes, number theory

0

10

Problem 52669. Count the primes in Collatz sequences

Created by: ChrisR

Tags primes, sequence, another collatz problem

1

7

Problem 52881. List the cuban primes

Created by: ChrisR

Tags primes, project euler, sequence

1

7

Problem 44403. Goldbach's marginal conjecture - Write integer as sum of three primes

Created by: yurenchu

Tags primes, goldbach conjecture

3

45

Problem 365. Numbers with prime factors 2, 3 and 5.

Created by: elias GR

Tags primes, factors

4

361

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

Created by: Ramon Villamangca

Tags easy, sequences, primes

1

15
1 – 50 of 74