A254219 Number of length 2 1..(n+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal.

0, 0, 0, 2, 2, 8, 12, 18, 18, 28, 28, 40, 50, 64, 64, 82, 82, 102, 118, 136, 136, 164, 182, 210, 232, 260, 260, 296, 296, 328, 356, 392, 424, 466, 466, 506, 542, 586, 586, 638, 638, 686, 728, 778, 778, 838, 884, 944, 994, 1050, 1050, 1118, 1168, 1236, 1290, 1352, 1352

Offset

1,4

Links

Alois P. Heinz, Table of n, a(n) for n = 1..10000 (first 210 terms from R. H. Hardin)

Example

All solutions for n=4:
..6....4
..4....6

Crossrefs

Row n=2 of A254218.

Sequence in context: A288506 A046690 A008828 * A053414 A189837 A274409

Adjacent sequences: A254216 A254217 A254218 * A254220 A254221 A254222

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Status

approved