## 250 problems in elementary number theory |

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### Contents

Divisibility of Numbers 1 23 | 1 |

Relatively Prime Numbers 3 35 | 3 |

Arithmetic Progressions 4 40 | 4 |

Copyright | |

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### Common terms and phrases

arbitrary positive integer Chinese remainder theorem composite numbers congruence consecutive positive integers decimal digits desired property different positive integers divisible easily check elementary means equal Euler's theorem exist infinitely exists a positive exists a prime Fermat Fermat prime Fermat's theorem Fibonacci sequence Find all solutions follows form 4k+3 given positive integer gives the remainder hence implies impossible increasing arithmetic progression induction infinite sequence infinitely many positive infinitely many primes infinitely many solutions instance integer coefficients integer exponent integer n itive integers last digit least positive integer left-hand side lemma Mersenne prime number n obtain odd prime pairwise relatively prime pip2 polynomial positive integer divisors positive integer solutions prime numbers Problem Prove by elementary quadratic residue rational numbers Remark satisfy the equation Schinzel concerning primes Sierpinski solutions in positive solvable Suppose theorem of Lejeune-Dirichlet three different primes triangular numbers twin primes y z x