A254542 - OEIS

%I #4 Feb 01 2015 09:42:56

%S 2,20,45,160,222,576,1026,1849,2461,4195,5217,8052,11098,15300,18210,

%T 25269,29296,38791,48468,60634,68591,87149,104149,126729,149195,

%U 177607,196492,236417,258581,301770,345756,398586,452724,522973,563863,640216

%N Number of length 4 1..(n+2) arrays with no leading partial sum equal to a prime

%C Row 4 of A254539

%H R. H. Hardin, <a href="/A254542/b254542.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..6....6....4....4....1....1....4....6....6....4....6....6....6....4....1....6

%e ..2....2....4....5....3....3....6....4....6....2....2....3....2....5....5....2

%e ..4....6....6....3....4....2....4....2....3....4....4....3....1....3....3....6

%e ..2....1....1....2....1....4....6....4....3....2....6....2....6....4....6....4

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 01 2015