A254205 Number of length 2 1..(n+2) arrays with no leading or trailing partial sum equal to a prime.

0, 1, 1, 4, 4, 11, 16, 23, 23, 34, 34, 47, 58, 73, 73, 92, 92, 113, 130, 149, 149, 178, 197, 226, 249, 278, 278, 315, 315, 348, 377, 414, 447, 490, 490, 531, 568, 613, 613, 666, 666, 715, 758, 809, 809, 870, 917, 978, 1029, 1086, 1086, 1155, 1206, 1275, 1330, 1393

Offset

1,4

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

The a(4)=4 solutions are (4,4), (4,6), (6,4), and (6,6).

Crossrefs

Row n=2 of A254204.

Cf. A254218.

Sequence in context: A327684 A231064 A302516 * A048223 A358825 A214112

Adjacent sequences: A254202 A254203 A254204 * A254206 A254207 A254208

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Status

approved