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 A251837 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime 1

%I #5 Dec 09 2014 15:53:36

%S 974,508,1803,5860,79817,1226031,6811452,332307262,17060512419,

%T 115557808374,20390744213799,3669049306262240,27687623355417760,

%U 18066638677524861299,11720523110601342578534,93975548122075184849030

%N Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime

%C Diagonal of A251845

%H R. H. Hardin, <a href="/A251837/b251837.txt">Table of n, a(n) for n = 1..17</a>

%e Some solutions for n=4

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 09 2014

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Last modified August 9 04:25 EDT 2024. Contains 375027 sequences. (Running on oeis4.)