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 A228295 The 'Honeycomb' or 'Beehive' sequence: a(n) = ceiling(12^(1/4)*n). 0
 0, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28, 30, 32, 34, 36, 38, 40, 41, 43, 45, 47, 49, 51, 53, 54, 56, 58, 60, 62, 64, 66, 68, 69, 71, 73, 75, 77, 79, 81, 82, 84, 86, 88, 90, 92, 94, 95, 97, 99, 101, 103, 105, 107, 108, 110, 112, 114, 116, 118, 120, 121 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Sequence gives the approximate perimeter of n hexagons of unit area, assuming each side is shared with another hexagon. This could form a Beatty sequence. This is not A195125, although they match until 37th term and never after the 1000th term. LINKS ABC Shop, The Code with description American Scientist, The Soap Film: An Analogue Computer American Scientist, Foams and Honeycombs The BBC Productions, The Code; see in particular Behind the Beehive - The Code - Episode 2 Thomas C. Hales, The Honeycomb Conjecture, arXiv:math/9906042 [math.MG], 1999-2002. Marcus P. F. du Sautoy, The Code, a DVD produced by Athena, 2011. Scienceray, Is Bee a Mathematician? - mathematics in nature. FORMULA a(n) = ceiling( 12^(1/4) * n ). MATHEMATICA f[n_] := Ceiling[ Sqrt[ Sqrt[12]]*n]; Array[f, 66, 0] CROSSREFS Cf. A011009. Sequence in context: A324847 A302696 A195125 * A184592 A247427 A316837 Adjacent sequences:  A228292 A228293 A228294 * A228296 A228297 A228298 KEYWORD nonn AUTHOR Marcus du Sautoy and Robert G. Wilson v, Aug 19 2013 STATUS approved

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Last modified August 4 08:25 EDT 2020. Contains 336201 sequences. (Running on oeis4.)