Centered Pentagonal Number
المؤلف:
Sloane, N. J. A
المصدر:
Sequence A005891/M4112 in "The On-Line Encyclopedia of Integer Sequences."
الجزء والصفحة:
...
16-12-2020
1229
Centered Pentagonal Number
A centered polygonal number consisting of a central dot with five dots around it, and then additional dots in the gaps between adjacent dots. The general term is 
, and the first few such numbers are 1, 6, 16, 31, 51, 76, ... (OEIS A005891). The generating function of the centered pentagonal numbers is
REFERENCES:
Sloane, N. J. A. Sequence A005891/M4112 in "The On-Line Encyclopedia of Integer Sequences."
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