The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A183857 a(n) = 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 Table of n, a(n) for n=1..55. Index entries for 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}] LinearRecurrence[{2, -1, 1, -2, 1}, {1, 4, 8, 14, 21}, 60] (* Harvey P. Dale, Apr 12 2020 *) CROSSREFS Cf. A183874. Sequence in context: A312698 A312699 A131937 * A088804 A344012 A027924 Adjacent sequences: A183854 A183855 A183856 * A183858 A183859 A183860 KEYWORD nonn,easy AUTHOR Clark Kimberling, Jan 07 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 13 20:42 EDT 2024. Contains 374288 sequences. (Running on oeis4.)