Cody

Problems

1 – 17 of 17
Problem Title
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Difficulty

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 52288. List Honaker primes

Created by: ChrisR

Tags primes, digit sum

2

9

Problem 47843. Compute the arithmetic derivative of integers

Created by: ChrisR

Tags primes, integers, arithmetic derivative

0

15

Problem 52639. Determine whether a number is unprimeable

Created by: ChrisR

Tags primes, project euler

3

9

Problem 50948. Identify prime words

Created by: ChrisR

Tags primes, strings

2

9

Problem 47793. Find the smallest prime with n inside

Created by: ChrisR

Tags primes, strings, sequence

2

13

Problem 52669. Count the primes in Collatz sequences

Created by: ChrisR

Tags primes, sequence, another collatz problem

1

7

Problem 47833. List the delete-a-digit primes

Created by: ChrisR

Tags sequences, primes

3

15

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

Created by: ChrisR

Tags primes, kaprekar

4

11

Problem 47518. Play Outside In with primes

Created by: ChrisR

Tags primes, puzzle, sequence

0

6

Problem 51241. Compute home primes in a given base

Created by: ChrisR

Tags primes, sequence, base conversion

0

6

Problem 51758. List Proth primes

Created by: ChrisR

Tags primes

0

6

Problem 52183. List the nth prime quartet prefix

Created by: ChrisR

Tags primes, convolution, sequence

0

5

Problem 47895. List the dihedral primes

Created by: ChrisR

Tags primes, sequence, symmetry

2

9

Problem 49783. List the good primes

Created by: ChrisR

Tags primes

1

10

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

Created by: ChrisR

Tags primes, number theory, sequence

2

7
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