Nonexistence of twenty-fourth power residue addition sets

Let n>1 be an integer, and let Fp denote a field of p elements for a prime p≡1(modn). By 2015, the question of existence or nonexistence of n-th power residue difference sets in Fp had been settled for all n<24. We settle the case n=24 by proving the nonexistence of 24-th power residue difference sets in Fp. We also prove the nonexistence of qualified 24-th power residue difference sets in Fp. The proofs make use of a Mathematica program which computes formulas for the cyclotomic numbers of order 24 in terms of parameters occurring in quadratic partitions of p.