A254208 Number of length 5 1..(n+2) arrays with no leading or trailing partial sum equal to a prime.

1, 11, 21, 176, 204, 898, 1653, 4078, 5075, 11512, 13456, 25925, 37275, 60717, 69689, 114352, 127928, 195039, 251161, 349001, 385157, 552907, 667293, 892038, 1075280, 1385235, 1510110, 2006079, 2156703, 2694466, 3157069, 3885393, 4484057, 5564130

Offset

1,2

Links

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

Example

For n=4, one of the a(4)=176 solutions is (1,5,4,2,4).  The forward sums are 1, 6, 10, 12, and 16, and the reverse sums are 4, 6, 10, 15, and 16.

Crossrefs

Row n=5 of A254204.

Cf. A254218.

Sequence in context: A321509 A034922 A015446 * A083177 A110466 A110383

Adjacent sequences: A254205 A254206 A254207 * A254209 A254210 A254211

Keyword

nonn

Author

R. H. Hardin, Jan 26 2015

Status

approved