Problems

1 – 20 of 20

Problem Title Likes Solvers Difficulty

Problem 2736. Pernicious Anniversary Problem

Created by: Jan Orwat

Tags easy, sequences, oeis

788

Problem 248. Twins in a Window

Created by: Ned Gulley

Tags primes

142

Problem 44384. Find the nearest prime number

Created by: Matthew Eicholtz

Tags prime numbers, cody5

614

Problem 44230. I'm going to enjoy watching you calculate, Mr Anderson

Created by: James

Tags number theory, phone numbers, agent smith

Problem 44385. Extra safe primes

Created by: Matthew Eicholtz

Tags prime numbers, cody5, safe prime

710

Problem 3016. Twin Primes

Created by: goc3

Tags prime, integer, sequence

Problem 896. Sophie Germain prime

Created by: Aurelien Queffurust

Tags prime, primes, sophie germain

625

Problem 2337. Sum of big primes without primes

Created by: Jean-Marie Sainthillier

Tags primes, project euler, eratosthenes

173

Problem 1204. Prime Time

Created by: James

Tags prime time, specific

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

Created by: yurenchu

Tags primes, goldbach conjecture

Problem 2910. Mersenne Primes vs. All Primes

Created by: goc3

Tags primes, comparison, powers

516

Problem 2595. Polite numbers. Politeness.

Created by: Jan Orwat

Tags number theory, oeis

148

Problem 60. The Goldbach Conjecture

Created by: Cody Team

Tags primes

5139

Problem 1672. Leftovers? Again?!

Created by: James

Tags leftovers, modulo

Problem 64. The Goldbach Conjecture, Part 2

Created by: Cody Team

Tags primes

2077

Problem 83. Prime factor digits

Created by: Cody Team

Tags primes

1939

Problem 1095. Circular Primes (based on Project Euler, problem 35)

Created by: James

Tags primes, projecteuler, circular reasoning

419

Problem 2342. Numbers spiral diagonals (Part 2)

Created by: Jean-Marie Sainthillier

Tags primes, project euler, spiral

115

Problem 1394. Prime Ladders

Created by: Ned Gulley

Tags primes

Problem 44377. Five steps to enlightenment

Created by: Alfonso Nieto-Castanon

Tags indexing, logic, cody5

1 – 20 of 20

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Problem Groups

Difficulty Rating

Problem Groups

Problems

Problem 2736. Pernicious Anniversary Problem

Problem 248. Twins in a Window

Problem 44384. Find the nearest prime number

Problem 44230. I'm going to enjoy watching you calculate, Mr Anderson

Problem 44385. Extra safe primes

Problem 3016. Twin Primes

Problem 896. Sophie Germain prime

Problem 2337. Sum of big primes without primes

Problem 1204. Prime Time

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

Problem 2910. Mersenne Primes vs. All Primes

Problem 2595. Polite numbers. Politeness.

Problem 60. The Goldbach Conjecture

Problem 1672. Leftovers? Again?!

Problem 64. The Goldbach Conjecture, Part 2

Problem 83. Prime factor digits

Problem 1095. Circular Primes (based on Project Euler, problem 35)

Problem 2342. Numbers spiral diagonals (Part 2)

Problem 1394. Prime Ladders

Problem 44377. Five steps to enlightenment