OFFSET
1,1
COMMENTS
Here powerful numbers are those for which every prime factor appears to a power at least 2.
LINKS
Andreas Reinhart, On orders in quadratic number fields whose set of distances is peculiar, arXiv:2305.09267 [math.NT], 2023.
Andreas Reinhart, A counterexample to the Pellian equation conjecture of Mordell, arXiv:2402.09827 [math.NT], 2024.
S. V. Sidorov and P. A. Shcherbakov, On the Period Length Modulo D of Sequences of Numerators and Denominators of Convergents for the Square Root of a Non-square D, Int'l Conf. Math. Modeling, Math. Modeling Supercomp. Tech. (MMST 2023) 28-43.
A. J. Stephens and H. C. Williams, Some computational results on a problem concerning powerful numbers, Math. Comp. 50 (1988), 619-632.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Mar 05 2008
EXTENSIONS
a(9)-a(17) from Andreas Reinhart, communicated by Hugo Pfoertner, May 24 2023
a(18)-a(21) from Andreas Reinhart, added by Michel Marcus, Feb 15 2024
STATUS
approved