Icosahedral number
An icosahedral number is a figurate number that represents an icosahedron. The nth icosahedral number is given by the formula
The first such numbers are 1, 12, 48, 124, 255, 456, 742, 1128, 1629, 2260, 3036, 3972, 5083, … (sequence A006564 in OEIS).
References
Kim, Hyun Kwang, On Regular Polytope Numbers (PDF), archived from the original (PDF) on 2010-03-07
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