Icosahedral number

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An icosahedral number is a figurate number that represents an icosahedron. The nth icosahedral number is given by the formula

{n(5n^2-5n+2) \over 2}

The first such numbers are 1, 12, 48, 124, 255, 456, 742, 1128, 1629, 2260, 3036, 3972, 5083, … (sequence A006564 in OEIS).

References

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