212441

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 31.at n=28A031619
• Number of n X 4 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors.at n=5A283539
• T(n,k)=Number of nXk 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors.at n=41A283543
• Number of 6 X n 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors.at n=3A283547
• Expansion of Product_{k>=1} B(x^k), where B(x) is the g.f. of A003114.at n=40A327690