On Pascal’s triangle modulo
Explicit normal integral bases are given for some cyclic quintic fields defined by Emma Lehmer’s parametric family of quintics.
Let denote the field of rational numbers. Let be a cyclic quartic extension of . It is known that there are unique integers , , , such that where The conductor of is , where A simple proof of this formula for is given, which uses the basic properties of quartic Gauss sums.
We give infinitely many new families of non-congruent numbers where the first prime factor of each number is of the form 8k+1 and the rest of the prime factors have the form 8k+3. Products of elements in each family are shown to be non-congruent.
We give an infinite set of distinct monogenic septimic fields whose normal closure has Galois group .
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