Problems

1 – 19 of 19

Problem Title Likes Solvers Difficulty

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

Created by: ChrisR

Tags primes, integers, arithmetic derivative integers

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

Created by: ChrisR

Tags primes, sequence, digit sum

Problem 51466. List prime anagrams of a number

Created by: ChrisR

Tags primes, permutations, anagram

Problem 51798. Label primes with the Erdos-Selfridge classification

Created by: ChrisR

Tags primes, number theory, guy a18

Problem 50948. Identify prime words

Created by: ChrisR

Tags primes, strings

Problem 52288. List Honaker primes

Created by: ChrisR

Tags primes, digit sum

Problem 47843. Compute the arithmetic derivative of integers

Created by: ChrisR

Tags primes, integers, arithmetic derivative

Problem 52639. Determine whether a number is unprimeable

Created by: ChrisR

Tags primes, project euler

Problem 47793. Find the smallest prime with n inside

Created by: ChrisR

Tags primes, strings, sequence

Problem 47833. List the delete-a-digit primes

Created by: ChrisR

Tags sequences, primes

Problem 52669. Count the primes in Collatz sequences

Created by: ChrisR

Tags primes, sequence, another collatz problem

Problem 49778. Determine whether a number is a prime self number

Created by: ChrisR

Tags primes, kaprekar

Problem 47518. Play Outside In with primes

Created by: ChrisR

Tags primes, puzzle, sequence

Problem 51241. Compute home primes in a given base

Created by: ChrisR

Tags primes, sequence, base conversion

Problem 52183. List the nth prime quartet prefix

Created by: ChrisR

Tags primes, convolution, sequence

Problem 51758. List Proth primes

Created by: ChrisR

Tags primes

Problem 47895. List the dihedral primes

Created by: ChrisR

Tags primes, sequence, symmetry

Problem 49783. List the good primes

Created by: ChrisR

Tags primes

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

Created by: ChrisR

Tags primes, number theory, sequence

1 – 19 of 19

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Problem Groups

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Problem Groups

Problems

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

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

Problem 51466. List prime anagrams of a number

Problem 51798. Label primes with the Erdos-Selfridge classification

Problem 50948. Identify prime words

Problem 52288. List Honaker primes

Problem 47843. Compute the arithmetic derivative of integers

Problem 52639. Determine whether a number is unprimeable

Problem 47793. Find the smallest prime with n inside

Problem 47833. List the delete-a-digit primes

Problem 52669. Count the primes in Collatz sequences

Problem 49778. Determine whether a number is a prime self number

Problem 47518. Play Outside In with primes

Problem 51241. Compute home primes in a given base

Problem 52183. List the nth prime quartet prefix

Problem 51758. List Proth primes

Problem 47895. List the dihedral primes

Problem 49783. List the good primes

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