A254203 Number of length n 1..(7+2) arrays with no leading or trailing partial sum equal to a prime.

5, 16, 68, 315, 1653, 9126, 50166, 266060, 1445197, 8388620, 49943639, 291356973, 1672450652, 9817427902, 60070829938, 373040809711, 2261787393319

Offset

1,1

Comments

Column 7 of A254204

Links

Table of n, a(n) for n=1..17.

Example

Some solutions for n=4
..8....9....6....4....6....9....8....9....4....4....1....4....9....8....4....8
..7....7....2....2....4....9....6....9....8....2....8....8....7....4....6....4
..6....5....7....3....6....7....4....9....8....2....9....9....6....6....4....6
..9....9....9....1....6....9....8....9....8....8....9....1....8....4....4....6

Crossrefs

Sequence in context: A323934 A166932 A027105 * A220903 A042087 A332470

Adjacent sequences: A254200 A254201 A254202 * A254204 A254205 A254206

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Status

approved