| In this paper, we obtain some results concerning annular regions containing all the zeros of a given polynomial. These
annular regions have radii in terms of the Bell numbers, Pell numbers, Stirling numbers, Fibonacci numbers, Motzkin numbers, Catalan
numbers, and/or the Schršoder numbers. Also, we show, by means of examples, that for some polynomials our results sharpen some of
the known results in this direction. |
