ON SMARANDACHE DIVISOR PRODUCTS

ON SMARANDACHE DMSOR PRODUCTS

MaohuaLe Department of Mathematics, Zhanjiang Normal College Zhanjiang, Guangdong, P.R. China.

Abstract. In this paper we give a formula for Smarandache divisor products.

Let n be a positive integer. In [1, Notion 20], the product of all positive divisors of n is called the Smarandache divisor product of n and denoted by P d (n). In this paper we give a formula ofPd(n) as follows: r1

Theorem. Let

n = P1 ... Pk

rk

be the factorization of n,

and let ( Y2 (r 1 + 1) ... (rl; + 1), (1) r(n)=~ L Y2 ((r1 + 1) ... (rl;+ 1) - 1),

Then we have P d (n) = n r(n)

if n is not a square, if n is a square.

.

Proof Let f (n) denote the number of distinct positive divisors of n. It is a well known fact that (2)

fen) = (r1 + 1) ... (rl; + 1),

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(See [2, Theorem 273]). Ifn is not a square and d is a positive divisor ofn, then nJd is also a positive divisor of n with n / d '" d. It implies that

Hence, by (1), (2) and (3), we get Pd(n) = n r(n).

If n is a square and d is a positive divisor of n with d '" in, then nJd is also a positive divisor ofn with n / d '" d.

So we have n

(4)

f (n) /2

Pin) = ------------ = n

o

(f(n l)/2.

in Therefore, by (1), (2) and (4), we get theorem is proved.

P d (n) = n r(n) too. The

References.

1. Dumitrescu and V. Seleacu, Some Notions and Questions In Number Theory, Erhus Dniv. Press, Glendale, 1994.

2. G.H.Hardy and e.M.Wright, An Introduction to the Theory of numbers, Oxford Dniv. Press, Oxford, 1938.

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