login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A184109 n + ceiling(n^2/9); complement of A184108. 2
2, 3, 4, 6, 8, 10, 13, 16, 18, 22, 25, 28, 32, 36, 40, 45, 50, 54, 60, 65, 70, 76, 82, 88, 95, 102, 108, 116, 123, 130, 138, 146, 154, 163, 172, 180, 190, 199, 208, 218, 228, 238, 249, 260, 270, 282, 293, 304, 316, 328, 340, 353, 366, 378, 392, 405, 418, 432, 446, 460, 475, 490, 504, 520, 535, 550, 566, 582, 598, 615, 632, 648, 666, 683, 700, 718, 736, 754, 773, 792, 810, 830, 849, 868, 888, 908, 928, 949, 970, 990 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Matthew House, Table of n, a(n) for n = 1..10000

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

FORMULA

G.f.: (2*x-x^2+x^4+x^7-x^9)/(1-2*x+x^2-x^9+2*x^10-x^11). - Matthew House, Feb 15 2017

a(n) = +2 a(n-1) -a(n-2) +a(n-9) -2 a(n-10) +a(n-11). - R. J. Mathar, Mar 11 2012

MATHEMATICA

a=9; b=-9;

Table[n+Floor[(a*n+b)^(1/2)], {n, 100}]

Table[n-1+Ceiling[(n^2-b)/a], {n, 90}]

PROG

(PARI) a(n)=a(n)=(n^2+9*n+8)\9 \\ Charles R Greathouse IV, Feb 15 2017

CROSSREFS

Complement of A184108.

Sequence in context: A083006 A096061 A100919 * A214780 A024174 A008739

Adjacent sequences:  A184106 A184107 A184108 * A184110 A184111 A184112

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jan 09 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 25 15:02 EDT 2019. Contains 321470 sequences. (Running on oeis4.)