Geodesic
On the $P_1$ property of sequences of positive integers
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2016), pp. 22-27

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In this paper we introduce the concept of $P_1$ property of sequences, consisting of positive integers and prove two criteria revealing this property. First one deals with rather slow increasing sequences while the second one works for those sequences of positive integers which satisfy certain number theoretic condition. Additionally, we prove the unboundedness of common divisors of distinct terms of sequences of the form $(2^{2^n}+d)^{\infty}_{n=1}$ for integers $d\neq1.$
Keywords: Fermat's number, prime number, greatest common divisor, Chinese Remainder Theorem. 
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     title = {On  the $P_1$  property of sequences of positive integers},
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T. L. Hakobyan. On  the $P_1$  property of sequences of positive integers. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2016), pp. 22-27. http://geodesic.mathdoc.fr/item/UZERU_2016_2_a3/