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, 2, 5, 12, 31, 57, 112, 296, 833, 1889, 5015, 11625, 30782, 80154, 202448, 526705, 1410549, 3698903

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