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On practical numbers of some special forms

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arxiv 1809.01532 v2 pith:S4GSVNIW submitted 2018-09-03 math.NT

On practical numbers of some special forms

classification math.NT
keywords practicalinfinitelymanynumberssomethereformsintegers
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In this paper we study practical numbers of some special forms. For any integers $b\ge0$ and $c>0$, we show that if $n^2+bn+c$ is practical for some integer $n>1$, then there are infinitely many nonnegative integers $n$ with $n^2+bn+c$ practical. We also prove that there are infinitely many practical numbers of the form $q^4+2$ with $q$ practical, and that there are infinitely many practical Pythagorean triples $(a,b,c)$ with $\gcd(a,b,c)=6$ (or $\gcd(a,b,c)=4$).

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