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 A244147 Number of hexagons (side length 1) that intersect the circumference of a circle of radius n centered at a lattice point. 1
 3, 9, 12, 15, 21, 24, 27, 39, 42, 39, 51, 54, 51, 63, 66, 69, 81, 78, 75, 99, 96, 93, 105, 114, 105, 123, 120, 117, 141, 138, 129, 147, 156, 153, 159, 162, 159, 177, 180, 171, 201, 192, 183, 201, 204, 201, 219, 216, 207, 237, 240, 225, 249, 258, 243, 267, 246, 261, 285, 276 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The pattern repeats itself at every 2*Pi/3 sector along the circumference. The hexagon count per one-third sector by rows can be arranged as an irregular triangle. The double hexagons in a row are symmetrically placed. See illustration. LINKS Table of n, a(n) for n=1..60. Kival Ngaokrajang, Illustration of initial terms Kival Ngaokrajang, Small Basic program PROG (Small Basic) See links. CROSSREFS Cf. A242118, A242394, A242395. Sequence in context: A138921 A194412 A136290 * A103531 A333441 A108860 Adjacent sequences: A244144 A244145 A244146 * A244148 A244149 A244150 KEYWORD nonn AUTHOR Kival Ngaokrajang, Jun 21 2014 STATUS approved

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Last modified May 25 16:17 EDT 2024. Contains 372801 sequences. (Running on oeis4.)