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Date: 25-4-2019
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Date: 9-6-2019
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where is the gamma function (Erdélyi et al. 1981, p. 217; Prudnikov et al. 1990, p. 799; Gradshteyn and Ryzhik 2000, p. 1109).
The notation is also sometimes used to denote the divisor function giving the number of divisors or the number of distinct prime factors of a positive integer .
REFERENCES:
Erdélyi, A.; Magnus, W.; Oberhettinger, F.; and Tricomi, F. G. "The Function and Related Functions." §18.3 in Higher Transcendental Functions, Vol. 3. New York: Krieger, pp. 217-224, 1981.
Gradshteyn, I. S. and Ryzhik, I. M. "The Functions , , , , ." §9.64 in Tables of Integrals, Series, and Products, 6th ed. San Diego, CA: Academic Press, p. 1109, 2000.
Prudnikov, A. P.; Marichev, O. I.; and Brychkov, Yu. A. Integrals and Series, Vol. 3: More Special Functions. Newark, NJ: Gordon and Breach, 1990.
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