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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A235046 Characteristic function for A235033. 4
0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0

COMMENTS

This is the characteristic function for A235033, cf. examples there. Cf. also the characteristic functions A236861 & A236862.

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..8191

FORMULA

a(n) = 0 iff A236380(n)=0, 1 otherwise. [This formula completely defines the sequence]

Other observations, which partially describe the behavior of the sequence:

For all x, y > 0, if either a(x) = 1 or a(y) = 1, then both a(x*y) = 1 and a(A048720(x,y)) = 1.

If A010051(n)*A091247(n) = 1, then a(n) = 1. [n is in A091209]

If A066247(n)*A091225(n) = 1, then a(n) = 1. [n is in A091214]

PROG

(Scheme) (define (A235046 n) (if (zero? (A236380 n)) 0 1))

CROSSREFS

Characteristic function of A235033.

Has zeros in the same positions as A236380.

Cf. also A010051, A066247, A048720, A061858, A091209, A091214, A091225, A091247, A235043, A235044, A234741 & A234742, A236861 & A236862.

Sequence in context: A215480 A143731 A079872 * A280046 A169672 A011672

Adjacent sequences:  A235043 A235044 A235045 * A235047 A235048 A235049

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jan 24 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 9 07:21 EST 2021. Contains 349627 sequences. (Running on oeis4.)