Search: id:A071398
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%I A071398
%S A071398 0,9,35,78,139,217,312,424,554,701,866,1048,1247,1464,1697,1949,2217,
%T A071398 2503,2806,3126,3464,3819,4192,4581,4988,5413,5854,6313,6790,7283,7794,
%U A071398 8323,8868,9431,10011,10609,11224,11856,12505,13172,13856,14558,15277
%N A071398 Rounded total surface area of a regular icosahedron with edge length 
               n.
%D A071398 S. Selby, editor, CRC Basic Mathematical Tables, CRC Press, 1970, pp. 
               10-11.
%H A071398 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Icosahedron.html">Link to a section of The World of Mathematics</
               a>
%H A071398 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               PlatonicSolid.html">Link to a section of The World of Mathematics</
               a>
%F A071398 a(n) = round(5 * n^2 * sqrt(3))
%e A071398 a(4)=139 because round(5*4^2*sqrt(3))=round(80*1.73205...)=round(138.56...)=139.
%o A071398 (PARI) for(n=0,100,print1(round(5*n^2*sqrt(3)),","))
%Y A071398 Cf. A070169 (tetrahedron), A033581 (cube), A071396 (octahedron), A071397 
               (dodecahedron), A071402 (volume of icosahedron).
%Y A071398 Sequence in context: A085366 A033566 A022275 this_sequence A005898 A034957 
               A002418
%Y A071398 Adjacent sequences: A071395 A071396 A071397 this_sequence A071399 A071400 
               A071401
%K A071398 easy,nonn
%O A071398 0,2
%A A071398 Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 29 2002

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