The Number a2 + b2 — dc2 Revisited
Nguyen Viet Dung and Luu Ba Thang
Department of Mathematics and Informatics
Hanoi National University of Education
136 Xuan Thuy
Cau Giay, Hanoi
Vietnam
Abstract:
In 2015, Nowicki posed the following question: let d = q or
d = 2q,
where q is a product of prime numbers of the form 4k + 1.
Is it true that d is a special number? We answer this open question.
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Received April 27 2021; revised version received September 27 2021.
Published in Journal of Integer Sequences,
October 1 2021.
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