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 A183857 n-1+ceiling((2/3)*n^2); complement of A183874. 1
 1, 4, 8, 14, 21, 29, 39, 50, 62, 76, 91, 107, 125, 144, 164, 186, 209, 233, 259, 286, 314, 344, 375, 407, 441, 476, 512, 550, 589, 629, 671, 714, 758, 804, 851, 899, 949, 1000, 1052, 1106, 1161, 1217, 1275, 1334, 1394, 1456, 1519, 1583, 1649, 1716, 1784, 1854, 1925, 1997, 2071 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Index entries for sequences related to linear recurrences with constant coefficients, signature (2,-1,1,-2,1). FORMULA a(n)=n-1+ceiling((2/3)n^2). MATHEMATICA a=3/2; b=0; Table[n+Floor[(a*n+b)^(1/2)], {n, 100}] Table[n-1+Ceiling[(n*n-b)/a], {n, 80}] CROSSREFS Cf. A183874. Sequence in context: A121896 A173290 A131937 * A088804 A027924 A006578 Adjacent sequences:  A183854 A183855 A183856 * A183858 A183859 A183860 KEYWORD nonn,easy AUTHOR Clark Kimberling, Jan 07 2011 STATUS approved

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