81541

Appears in sequences

• Number of 4 X 4 symmetric magic squares with line sum 2n.at n=18A093198
• Number of 5Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=7A241360
• First of 5 consecutive semiprimes congruent to 1,2,3,4,5 (mod 6).at n=15A367104