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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A188089 Positions of 0 in the zero-one sequence [nr+4r]-[nr]-[4r], where r=sqrt(3), n>=1. 1
11, 26, 41, 52, 67, 82, 97, 108, 123, 138, 153, 164, 179, 194, 205, 220, 235, 250, 261, 276, 291, 306, 317, 332, 347, 362, 373, 388, 403, 414, 429, 444, 459, 470, 485, 500, 515, 526, 541, 556, 571, 582, 597, 612, 623, 638, 653, 668, 679, 694, 709, 724, 735, 750, 765, 776, 791, 806, 821, 832, 847, 862, 877, 888, 903, 918, 933, 944, 959, 974, 985, 1000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See A187950.

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..10000

MATHEMATICA

r=3^(1/2); k=4;

seqA=Table[Floor[n*r+k*r]-Floor[n*r]-Floor[k*r],

{n, 1, 220}]

Flatten[Position[seqA, 0] ]   (* A188089 *)

Flatten[Position[seqA, 1] ]   (* positions of 1 *)

PROG

(Python)

from gmpy2 import isqrt

A188089_list = [n for n in range(1, 10**6) if isqrt(3*(n+4)**2) - isqrt(3*n**2) == 6] # Chai Wah Wu, Oct 08 2016

CROSSREFS

A187950.

Sequence in context: A035935 A193107 A084584 * A190699 A003345 A047722

Adjacent sequences:  A188086 A188087 A188088 * A188090 A188091 A188092

KEYWORD

nonn

AUTHOR

Clark Kimberling, Mar 20 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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 23 18:08 EDT 2022. Contains 353993 sequences. (Running on oeis4.)