57458

Appears in sequences

• Number of n X 4 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 0 1 0 vertically.at n=7A207770
• Fibonacci sequence beginning 2, 21.at n=18A294116
• Take a squarefree semiprime and take the difference of its prime factors. If it is a squarefree semiprime repeat the process. Sequence lists the squarefree semiprimes that generate other squarefree semiprimes only in the first k steps of this process. Case k = 5.at n=26A296812
• a(n) = 32*n^2 - 40*n + 10.at n=42A343578