单词 | Pentagonal Number |
释义 | Pentagonal Number![]() A Polygonal Number of the form ![]() Every pentagonal number is 1/3 of a Triangular Number. The so-called generalized pentagonal numbers are given by
Guy, R. K. ``Sums of Squares.'' §C20 in Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, pp. 136-138, 1994. Pappas, T. ``Triangular, Square & Pentagonal Numbers.'' The Joy of Mathematics. San Carlos, CA: Wide World Publ./Tetra, p. 214, 1989. Sloane, N. J. A. SequencesA000326/M3818and A001318/M1336in ``An On-Line Version of the Encyclopedia of Integer Sequences.''http://www.research.att.com/~njas/sequences/eisonline.html and Sloane, N. J. A. and Plouffe, S.The Encyclopedia of Integer Sequences. San Diego: Academic Press, 1995. |
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