31381

Appears in sequences

• Crystal ball sequence for diamond.at n=33A007904
• Nonattacking queens on a 2n+1 X 2n+1 toroidal board, solutions which differ only by rotation, reflection or torus shift count only once.at n=11A053994
• Quadruple lucky numbers (lower terms). Numbers n such that n, n+2, n+6, n+8 are all Lucky numbers.at n=25A139783