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http://dx.doi.org/10.4134/JKMS.2015.52.4.751

A CLASS OF NEW NEAR-PERFECT NUMBERS  

LI, YANBIN (Institute of Mathematics and Software Science Sichuan Normal University)
LIAO, QUNYING (Institute of Mathematics and Software Science Sichuan Normal University)
Publication Information
Journal of the Korean Mathematical Society / v.52, no.4, 2015 , pp. 751-763 More about this Journal
Abstract
Let ${\alpha}$ be a positive integer, and let $p_1$, $p_2$ be two distinct prime numbers with $p_1$ < $p_2$. By using elementary methods, we give two equivalent conditions of all even near-perfect numbers in the form $2^{\alpha}p_1p_2$ and $2^{\alpha}p_1^2p_2$, and obtain a lot of new near-perfect numbers which involve some special kinds of prime number pairs. One kind is exactly the new Mersenne conjecture's prime number pair. Another kind has the form $p_1=2^{{\alpha}+1}-1$ and $p_2={\frac{p^2_1+p_1+1}{3}}$, where the former is a Mersenne prime and the latter's behavior is very much like a Fermat number.
Keywords
perfect number; pseudoperfect number; near-perfect number; k-near-perfect number;
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