Prime Numbers I

Curated by : ChrisR

Average Problem Difficulty:

Prime numbers, sequences, patterns, and other facts. See also The Prime Directive. 

Community Group Solver

+50 points

Problem Title	Likes	Solvers
Problem 45964. Compute the nth Pythagorean prime Created by: ChrisR Tags primes, pythagoras, number theory	1	33
Problem 49738. Determine whether a prime is Pythagorean Created by: ChrisR Tags primes, pythagoras, number theory	1	24
Problem 46624. List the emirps Created by: ChrisR Tags sequences, primes	2	42
Problem 46701. Compute the nth Naerogahtyp emirp Created by: ChrisR Tags primes, pythagoras	1	12
Problem 45994. Investigate the frequency of last digits of prime numbers Created by: ChrisR Tags primes, number theory	3	16
Problem 46046. Determine whether a number is a cluster prime Created by: ChrisR Tags primes, number theory	4	18
Problem 46047. Identify Wagstaff primes Created by: ChrisR Tags primes	2	31
Problem 46099. Identify full reptend primes Created by: ChrisR Tags primes, number theory	0	13
Problem 46054. Count trailing zeros in a primorial Created by: ChrisR Tags primes, number theory, primorial	4	29
Problem 46057. Find the last non-zero digit in a primorial Created by: ChrisR Tags primes, number theory, primorial	1	16
Problem 46060. Identify primorial primes Created by: ChrisR Tags primes, number theory, primorial	1	16
Problem 46087. Investigate the frequency of last non-zero digits of primorials Created by: ChrisR Tags primes, number theory, primorial	1	11
Problem 46016. Determine digits of the Copeland-Erdos constant Created by: ChrisR Tags numbers, number theory	4	19
Problem 46050. Construct a prime circle Created by: ChrisR Tags primes	7	38
Problem 46582. Find jumping medalists Created by: ChrisR Tags primes, sorting, number theory	3	17
Problem 46117. Test approximations of the prime counting function Created by: ChrisR Tags special functions	1	15
Problem 46594. Create a sequence of primes p such that p > n π(p) Created by: ChrisR Tags primes, sequence	1	12
Problem 47950. Test the generalized Legendre conjecture Created by: ChrisR Tags primes, conjecture	0	14
Problem 48075. Play PRIMEGAME Created by: ChrisR Tags primes, sequence, conway	2	14

Recent Group Finishers7

Recent Activity

	Riccardo G. submitted Solution 14539655 to Problem 46060. Identify primorial primes on 8 Feb 2025
	Riccardo G. submitted Solution 14539624 to Problem 46016. Determine digits of the Copeland-Erdos constant on 8 Feb 2025
	James submitted Solution 14530341 to Problem 45994. Investigate the frequency of last digits of prime numbers on 24 Jan 2025
	DH submitted Solution 14429219 to Problem 49738. Determine whether a prime is Pythagorean on 4 Dec 2024
	DH submitted Solution 14400827 to Problem 46624. List the emirps on 20 Nov 2024

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