287509

Appears in sequences

• Antidiagonal sums of triangular array T: T(j,1) = 1 for ((j-1) mod 8) < 4, else 0; T(j,k) = T(j-1,k-1) + T(j,k-1) for 2 <= k <= j.at n=37A131077
• Semiprimes of the form (2^k - m)*(m*2^k - 1).at n=27A239038