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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A085003 Partial sums of A085002. 5
1, 2, 2, 2, 2, 3, 4, 4, 4, 4, 5, 6, 7, 7, 7, 8, 9, 10, 10, 10, 11, 12, 13, 13, 13, 13, 14, 15, 15, 15, 15, 16, 17, 18, 18, 18, 19, 20, 21, 21, 21, 22, 23, 24, 24, 24, 24, 25, 26, 26, 26, 26, 27, 28, 28, 28, 28, 29, 30, 31, 31, 31, 32, 33, 34, 34, 34, 34, 35, 36, 36, 36, 36, 37, 38 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10946

B. Cloitre, Graph of A085005(n) for n=1 up to 3874 [archive.org link]

FORMULA

a(n)=sum(k=1, n, A085002(k)).

a(A283766(n)) = n for all n >= 1. - Antti Karttunen, Mar 17 2017

MATHEMATICA

Accumulate[Table[Floor[GoldenRatio*n]-2*Floor[GoldenRatio*n/2], {n, 110}]] (* Harvey P. Dale, Dec 11 2012 *)

PROG

(PARI) sum(k=1, n, (k+sqrtint(5*k^2))%4>1) \\ Charles R Greathouse IV, Feb 07 2013

(Scheme, with memoization-macro definec)

(definec (A085003 n) (if (= 1 n) n (+ (A085002 n) (A085003 (- n 1)))))

;; Antti Karttunen, Mar 17 2017

CROSSREFS

Partial sums of A085002. A left inverse of A283766.

Cf. A083035, A083036, A083037, A083038, A085004, A085005.

Sequence in context: A301426 A194222 A025779 * A119026 A064775 A260731

Adjacent sequences:  A085000 A085001 A085002 * A085004 A085005 A085006

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Jun 17 2003

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 October 20 05:42 EDT 2019. Contains 328247 sequences. (Running on oeis4.)