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 A214726 Decimal expansion of the perimeter of Cairo and Prismatic tiles. 2
 3, 8, 6, 3, 7, 0, 3, 3, 0, 5, 1, 5, 6, 2, 7, 3, 1, 4, 6, 9, 9, 8, 9, 7, 2, 7, 9, 8, 9, 1, 5, 5, 8, 9, 4, 7, 0, 5, 3, 5, 6, 1, 9, 3, 5, 6, 0, 3, 3, 6, 1, 8, 2, 0, 1, 6, 0, 9, 3, 7, 2, 3, 0, 5, 2, 4, 1, 6, 9, 2, 8, 5, 5, 9, 1, 9, 4, 2, 2, 0, 6, 5, 3, 9, 0, 2, 4, 6, 9, 6, 7, 4, 3, 2, 2, 8, 1, 8, 0, 8 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS An algebraic integer with degree 4 and minimal polynomial x^4 - 16x^2 + 16. - Charles R Greathouse IV, Apr 21 2016 Length of the longest diagonal in a regular 12-gon with unit side. - Mohammed Yaseen, Dec 13 2020 LINKS Ping Ngai Chung, Miguel A. Fernandez, Yifei Li, Michael Mara, Frank Morgan, Isamar Rosa Plata, Niralee Shah, Luis Sordo Vieira, Elena Wikner, Isoperimetric Pentagonal Tilings, arXiv:1111.6161 [math.MG], 2011. Ping Ngai Chung, Miguel A. Fernandez, Yifei Li, Michael Mara, Frank Morgan, Isamar Rosa Plata, Niralee Shah, Luis Sordo Vieira, Elena Wikner, Isoperimetric Pentagonal Tilings, Not. AMS, Vol. 59, No. 5, May 2012, pp. 632-640. FORMULA 2*(sqrt(2+sqrt(3))) = 3.8637033051562731469989727989.... PROG (PARI) 2*sqrt(2+sqrt(3)) \\ Charles R Greathouse IV, Apr 21 2016 CROSSREFS Cf. A002193, A002194. Sequence in context: A175184 A019604 A336079 * A106291 A137987 A212007 Adjacent sequences:  A214723 A214724 A214725 * A214727 A214728 A214729 KEYWORD nonn,cons,easy AUTHOR Jonathan Vos Post, Jul 26 2012 STATUS approved

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Last modified May 15 01:35 EDT 2021. Contains 343909 sequences. (Running on oeis4.)