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!)
A249041 Number of odd terms in first n terms of A249039. 3
1, 1, 1, 2, 3, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 7, 8, 8, 9, 10, 11, 12, 13, 13, 14, 15, 16, 16, 17, 17, 17, 18, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 23, 23, 23, 24, 25, 25, 26, 26, 26, 26, 27, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 33, 33, 34, 35, 35, 36 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Rémy Sigrist, Colored scatterplot of (a(n-1-a(n-1))/n, a(a(n-1))/n) for n <= 500000000 (where the hue is function of n)

FORMULA

For n > 2: a(n) = a(n-1) + A249039(n) mod 2. - Reinhard Zumkeller, Nov 11 2014

a(n) = n - a(a(n-1)) - a(n-1-a(n-1)) with a(1) = a(2) = 1. - Altug Alkan, May 01 2019

MAPLE

See A249039.

PROG

(Haskell)

a249041 n = a249041_list !! (n-1)

a249041_list = tail $ scanl (\i j -> i + mod j 2) 0 a249039_list

-- Reinhard Zumkeller, Nov 11 2014

CROSSREFS

Cf. A249039, A249040, A287422.

Sequence in context: A082090 A060197 A116487 * A070546 A034586 A268383

Adjacent sequences: A249038 A249039 A249040 * A249042 A249043 A249044

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 26 2014

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 January 31 04:27 EST 2023. Contains 359947 sequences. (Running on oeis4.)