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<p>83.253.225.184: </p>
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<div>An '''icosahedral number''' is a [[figurate number]] that represents an [[icosahedron]]. The ''n''th icosahedral number is given by the formula<br />
<br />
:<math>{n(5n^2-5n+2) \over 2}</math><br />
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The first such numbers are 1, 12, 48, 124, 255, 456, 742, 1128, 1629, 2260, 3036, 3972, 5083, … {{OEIS|id=A006564}}.<br />
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==References==<br />
{{Citation | last = Kim | first = Hyun Kwang | title = On Regular Polytope Numbers | url = http://com2mac.postech.ac.kr/papers/2001/01-22.pdf | archiveurl = http://web.archive.org/web/20100307080303/http://com2mac.postech.ac.kr/papers/2001/01-22.pdf | archivedate = 2010-03-07}}<br />
<br />
{{Classes of natural numbers}}<br />
{{Num-stub}}<br />
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[[Category:Figurate numbers]]</div>
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