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Number of (n+1) X (7+1) 0..3 arrays with every 2 X 2 subblock summing to a prime.
1

%I #6 Jan 16 2022 00:15:09

%S 20039054,9883202426,4606843590302,2183158464447536,

%T 1028696788230851944,486569802610722280938,229687326408274791177808,

%U 108605494730585927438945340,51299121137631000207920371548

%N Number of (n+1) X (7+1) 0..3 arrays with every 2 X 2 subblock summing to a prime.

%C Column 7 of A251459.

%H R. H. Hardin, <a href="/A251458/b251458.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=1

%e ..0..0..0..0..2..2..1..1....0..0..0..2..2..1..0..3....0..0..0..0..3..1..0..2

%e ..0..3..2..3..0..1..1..0....0..3..0..0..1..1..0..2....2..3..2..0..0..1..0..3

%Y Cf. A251459.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 02 2014