THE PRIMES IN SMARANDACHE PO\VER PRODUCT SEQUENCES

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THE PRIMES IN SMARANDACHE PO\VER PRODUCT SEQUENCES Maohua Le and Kejian Wu Zhanjiang Nonnal College, Zhanjiang, Guangdong, P.R.China

Abstract For any positive integer k, let Ak be the Smarandache k-power product sequence. In this paper we prove that if k is an odd integer, \\ith k> 1, then Ak contains only one prime 2.

In [1], Iacobescu defined the sequence {H-ciC2 ... Cn}n~l; is the Smarandache cubic product sequence, where Cn is the n-th cubic number. Simultaneous, he posed the following question: Question: Hou many primes are in the sequence {I +CIC2 ... CJn~1 ? We nou give a general definition as follows: For any positive integers k, n let

and let Ak = {ak(n)ln~l. Then Ak is called the Smarandache k-power product sequence. In this paper we prove the following result: Theorem. If k is an odd integer, with k> 1, then Ak contains only one prime 2. Clearly, the above result completely solves Iacobescu's question. Proof of Theorem. We see from (1) that

Ifk is an odd integer, with k>l, then from (2) we get (3)

akCn)=lk-Cn!)k = (l+n!)(1 - n!

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(nl)2 _ ... _ (nf)k-Z", (n,)k-l)

When n = I, ak(l) = 2 is a prime. When n > 1, since


we find from (3) that ak(n) is not a prime. Thus, the sequence Ak contains only one prime 2. The theorem is proved.

Reference: 1. F. Iacobescu, "Smarandache partition type and other sequences", Bulletin of Pure and applied Sciences, 16E( 1997), No.2, 237-240.

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