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!)
A261937 Number of (n+1)X(2+1) 0..1 arrays with each row nonprime and column prime, read as a binary number with top and left being the most significant bits. 0
0, 2, 5, 12, 31, 57, 112, 296, 833, 1889, 5015, 11625, 30782, 80154, 202448, 526705, 1410549, 3698903 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A261942.

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

Some solutions for n=4

..0..0..1....1..1..0....1..1..0....0..0..0....1..0..0....0..0..0....0..0..0

..0..0..1....0..0..0....1..0..0....1..0..0....1..0..0....0..0..1....0..0..0

..0..0..1....0..0..0....1..0..0....1..1..0....1..1..0....0..0..1....0..0..1

..1..1..0....0..0..1....0..0..1....0..0..1....0..0..1....1..1..0....1..1..0

..0..0..1....1..1..0....1..1..0....1..1..0....1..1..0....0..0..1....0..0..1

CROSSREFS

Cf. A261942.

Sequence in context: A112412 A309506 A319557 * A305311 A291239 A193284

Adjacent sequences:  A261934 A261935 A261936 * A261938 A261939 A261940

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 06 2015

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 June 22 11:53 EDT 2021. Contains 345375 sequences. (Running on oeis4.)