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A254220 Number of length 3 1..(n+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal.

%I A254220 #6 Jul 23 2025 14:33:23
%S A254220 0,1,3,11,12,32,48,86,98,172,183,295,383,525,559,793,829,1110,1324,
%T A254220 1646,1709,2199,2531,3056,3469,4088,4240,5109,5232,6062,6762,7716,
%U A254220 8528,9788,9981,11227,12290,13721,14030,15841,16146,17912,19384,21355,21760,24188
%N A254220 Number of length 3 1..(n+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal.
%C A254220 Row 3 of A254218
%H A254220 R. H. Hardin, <a href="/A254220/b254220.txt">Table of n, a(n) for n = 1..210</a>
%e A254220 All solutions for n=4
%e A254220 ..1....6....4....4....1....4....6....6....4....6....6
%e A254220 ..5....3....6....2....3....2....2....4....5....3....2
%e A254220 ..4....6....4....6....6....4....4....6....1....1....6
%K A254220 nonn
%O A254220 1,3
%A A254220 _R. H. Hardin_, Jan 26 2015