Prime Numbers II

Curated by : ChrisR

Average Problem Difficulty:

Euclid proved that the number of primes is infinite. How about the number of Cody Problems involving primes?

Community Group Solver

+50 points

Problem Title	Likes	Solvers
Problem 47833. List the delete-a-digit primes Created by: ChrisR Tags sequences, primes	3	19
Problem 47895. List the dihedral primes Created by: ChrisR Tags primes, sequence, symmetry	2	12
Problem 49783. List the good primes Created by: ChrisR Tags primes	1	14
Problem 49778. Determine whether a number is a prime self number Created by: ChrisR Tags primes, kaprekar	4	15
Problem 51241. Compute home primes in a given base Created by: ChrisR Tags primes, sequence, base conversion	0	10
Problem 51758. List Proth primes Created by: ChrisR Tags primes	1	11
Problem 51798. Label primes with the Erdos-Selfridge classification Created by: ChrisR Tags primes, number theory, guy a18	2	13
Problem 52288. List Honaker primes Created by: ChrisR Tags primes, digit sum	2	13
Problem 52183. List the nth prime quartet prefix Created by: ChrisR Tags primes, convolution, sequence	1	9
Problem 47793. Find the smallest prime with n inside Created by: ChrisR Tags primes, strings, sequence	3	17
Problem 51466. List prime anagrams of a number Created by: ChrisR Tags primes, permutations, anagram	1	19
Problem 52639. Determine whether a number is unprimeable Created by: ChrisR Tags primes, project euler	3	15
Problem 52669. Count the primes in Collatz sequences Created by: ChrisR Tags primes, sequence, another collatz problem	1	16
Problem 47518. Play Outside In with primes Created by: ChrisR Tags primes, puzzle, sequence	1	9
Problem 50948. Identify prime words Created by: ChrisR Tags primes, strings	2	16
Problem 51198. Find pairs of primes with the same digit sum and a specified separation Created by: ChrisR Tags primes, sequence, digit sum	1	13
Problem 51077. List composite numbers that cannot be written as the sum of two primes Created by: ChrisR Tags primes, number theory, sequence	3	11
Problem 47843. Compute the arithmetic derivative of integers Created by: ChrisR Tags primes, integers, arithmetic derivative	0	25
Problem 49733. Solve the arithmetic differential equation D(n) = n Created by: ChrisR Tags primes, integers, arithmetic derivative integers	0	11

Recent Group Finishers7

Recent Activity

	George Berken submitted Solution 14305365 to Problem 49733. Solve the arithmetic differential equation D(n) = n on 14 Sep 2024
	George Berken submitted Solution 14305353 to Problem 49733. Solve the arithmetic differential equation D(n) = n on 14 Sep 2024
	George Berken submitted Solution 14305353 to Problem 49733. Solve the arithmetic differential equation D(n) = n on 14 Sep 2024
	George Berken submitted Solution 14305165 to Problem 47843. Compute the arithmetic derivative of integers on 13 Sep 2024
	George Berken submitted Solution 14305115 to Problem 51077. List composite numbers that cannot be written as the sum of two primes on 13 Sep 2024

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