Problems

51 – 89 of 89

Problem Title Likes Solvers Difficulty

Problem 241. Project Euler: Problem 7, Nth prime

Created by: Doug Hull

Tags primes, projecteuler

1114

Problem 2340. Numbers spiral diagonals (Part 1)

Created by: Jean-Marie Sainthillier

Tags primes, project euler, spiral

165

Problem 46594. Create a sequence of primes p such that p > n π(p)

Created by: ChrisR

Tags primes, sequence

Problem 46099. Identify full reptend primes

Created by: ChrisR

Tags primes, number theory

Problem 52669. Count the primes in Collatz sequences

Created by: ChrisR

Tags primes, sequence, another collatz problem

Problem 47833. List the delete-a-digit primes

Created by: ChrisR

Tags sequences, primes

Problem 365. Numbers with prime factors 2, 3 and 5.

Created by: elias GR

Tags primes, factors

413

Problem 42914. Counting the Grand Primes

Created by: John D'Errico

Tags prime, primes, intersect

Problem 52789. Easy Sequences 26: Prime-Integer Line Segments

Created by: Ramon Villamangca

Tags easy, primes, geometry

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

Created by: ChrisR

Tags primes, kaprekar

Problem 51241. Compute home primes in a given base

Created by: ChrisR

Tags primes, sequence, base conversion

Problem 47518. Play Outside In with primes

Created by: ChrisR

Tags primes, puzzle, sequence

Problem 46087. Investigate the frequency of last non-zero digits of primorials

Created by: ChrisR

Tags primes, number theory, primorial

Problem 45994. Investigate the frequency of last digits of prime numbers

Created by: ChrisR

Tags primes, number theory

Problem 47895. List the dihedral primes

Created by: ChrisR

Tags primes, sequence, symmetry

Problem 51758. List Proth primes

Created by: ChrisR

Tags primes

Problem 48075. Play PRIMEGAME

Created by: ChrisR

Tags primes, sequence, conway

Problem 49783. List the good primes

Created by: ChrisR

Tags primes

Problem 60. The Goldbach Conjecture

Created by: Cody Team

Tags primes

4795

Problem 64. The Goldbach Conjecture, Part 2

Created by: Cody Team

Tags primes

1911

Problem 52784. Easy Sequences 38: Prime Number Delta

Created by: Ramon Villamangca

Tags easy, primes, number theory

Problem 57477. Solve an equation involving primes and fractions

Created by: ChrisR

Tags primes, number theory, sequence

Problem 659. How long is the longest prime diagonal?

Created by: Ned Gulley

Tags primes, spiral, diagonal

375

Problem 46066. Evaluate the logarithmic integral

Created by: ChrisR

Tags primes, number theory, special functions

Problem 46582. Find jumping medalists

Created by: ChrisR

Tags primes, sorting, number theory

Problem 46701. Compute the nth Naerogahtyp emirp

Created by: ChrisR

Tags primes, pythagoras

Problem 54295. prime consecutive sums

Created by: CXD

Tags primes, series, numbers

Problem 52183. List the nth prime quartet prefix

Created by: ChrisR

Tags primes, convolution, sequence

Problem 57417. Easy Sequences 86: The "real" Hyperprimorials

Created by: Ramon Villamangca

Tags easy, primes, number theory

Problem 83. Prime factor digits

Created by: Cody Team

Tags primes

1748

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

Created by: James

Tags primes, projecteuler, circular reasoning

293

Problem 46050. Construct a prime circle

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

Problem 53810. List the Beatriz numbers

Created by: ChrisR

Tags primes, number theory, sequence

Problem 54620. List the Euclid numbers

Created by: ChrisR

Tags primes, sequence, infinitude

Problem 52313. Truncatable Primes

Created by: Dyuman Joshi

Tags primes

51 – 89 of 89

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