Infinitely Many Carmichael Numbers for a Modified Miller
... We describe the argument used in [AGP94] to prove there are infinitely many carmichael numbers. By Korselt’s criterion [Kor99] a positive composite integer n > 1 is a Carmichael number iff it is odd and squarefree and for all primes p dividing n, n ≡ 1 (mod p − 1). The approach of [AGP94] uses this ...
... We describe the argument used in [AGP94] to prove there are infinitely many carmichael numbers. By Korselt’s criterion [Kor99] a positive composite integer n > 1 is a Carmichael number iff it is odd and squarefree and for all primes p dividing n, n ≡ 1 (mod p − 1). The approach of [AGP94] uses this ...
Introduction to Number Theory 1 What is Number
... what the definitions of gcd and lcm actually imply. Example 5 (Math League HS 2000-2001). With each entry I submit, I have to write a different pair of positive integers whose greatest common factor is 1 and whose sum is 2000. (Pairs differing only in the order of addition are counted as 1 pair, not ...
... what the definitions of gcd and lcm actually imply. Example 5 (Math League HS 2000-2001). With each entry I submit, I have to write a different pair of positive integers whose greatest common factor is 1 and whose sum is 2000. (Pairs differing only in the order of addition are counted as 1 pair, not ...
Collatz conjecture
The Collatz conjecture is a conjecture in mathematics named after Lothar Collatz, who first proposed it in 1937. The conjecture is also known as the 3n + 1 conjecture, the Ulam conjecture (after Stanisław Ulam), Kakutani's problem (after Shizuo Kakutani), the Thwaites conjecture (after Sir Bryan Thwaites), Hasse's algorithm (after Helmut Hasse), or the Syracuse problem; the sequence of numbers involved is referred to as the hailstone sequence or hailstone numbers (because the values are usually subject to multiple descents and ascents like hailstones in a cloud), or as wondrous numbers.Take any natural number n. If n is even, divide it by 2 to get n / 2. If n is odd, multiply it by 3 and add 1 to obtain 3n + 1. Repeat the process (which has been called ""Half Or Triple Plus One"", or HOTPO) indefinitely. The conjecture is that no matter what number you start with, you will always eventually reach 1. The property has also been called oneness.Paul Erdős said about the Collatz conjecture: ""Mathematics may not be ready for such problems."" He also offered $500 for its solution.