A184009 n-1+ceiling((3/4)n^2); complement of A184008.

1, 3, 6, 10, 15, 21, 27, 35, 43, 52, 62, 73, 85, 97, 111, 125, 140, 156, 173, 191, 209, 229, 249, 270, 292, 315, 339, 363, 389, 415, 442, 470, 499, 529, 559, 591, 623, 656, 690, 725, 761, 797, 835, 873, 912, 952, 993, 1035, 1077, 1121, 1165, 1210, 1256, 1303, 1351, 1399, 1449, 1499, 1550, 1602, 1655, 1709, 1763, 1819, 1875, 1932, 1990, 2049, 2109, 2169, 2231, 2293

Offset

1,2

Links

Table of n, a(n) for n=1..72.

Index entries for linear recurrences with constant coefficients, signature (2,-1,0,0,0,0,1,-2,1).

Mathematica

a=7/3; b=0;
Table[n+Floor[(a*n+b)^(1/2)], {n, 100}]
Table[n-1+Ceiling[(n*n-b)/a], {n, 80}]

Crossrefs

Cf. A184008.

Sequence in context: A194082 A061786 A171971 * A105334 A249736 A371473

Adjacent sequences: A184006 A184007 A184008 * A184010 A184011 A184012

Keyword

nonn,easy

Author

Clark Kimberling, Jan 08 2011

Status

approved