login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A188070 Positions of 1 in A188068; complement of A188069. 5
2, 3, 5, 6, 7, 9, 10, 11, 13, 14, 16, 17, 18, 20, 21, 22, 24, 25, 26, 28, 29, 31, 32, 33, 35, 36, 37, 39, 40, 41, 43, 44, 46, 47, 48, 50, 51, 52, 54, 55, 57, 58, 59, 61, 62, 63, 65, 66, 67, 69, 70, 72, 73, 74, 76, 77, 78, 80, 81, 82, 84, 85, 87, 88, 89, 91, 92, 93, 95, 96, 97, 99, 100, 102, 103, 104, 106, 107, 108, 110, 111, 113, 114, 115, 117, 118, 119, 121, 122, 123, 125 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Cf. A188014, A188068.

Also positions of 3 in A007538. - Reinhard Zumkeller, Feb 14 2012

From Peter G. Anderson, Aug 24 2012: (Start)

a(n) = ceiling(n*x) where x = (1+sqrt(3))/2;

continued fraction of x is [1,2,1,2,1,2,...]. (End)

LINKS

Table of n, a(n) for n=1..91.

MATHEMATICA

(See A188068.)

PROG

(Haskell)

a188070 n = a188070_list !! (n-1)

a188070_list = filter ((== 3) . a007538) [1..]

-- Reinhard Zumkeller, Feb 14 2012

(J)  >. (2 %~ 1 + %:3) * i.100  - Peter G. Anderson, Aug 24 2012

CROSSREFS

Cf. A188014, A188068, A188069.

A215781 is ceiling(n*(sqrt(3)-1)).

Sequence in context: A083347 A137217 A023705 * A305847 A248565 A065896

Adjacent sequences:  A188067 A188068 A188069 * A188071 A188072 A188073

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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 15 02:21 EDT 2021. Contains 343909 sequences. (Running on oeis4.)