1919129

Appears in sequences

• Define a(1)=0, a(2)=0, a(3)=1, a(4)=3, a(5)=18, a(6)=22, a(7)=119, a(8)=285. Then a(n) = a(n-8) + 4*sqrt(420*a(n-4)^2 + 420*a(n-4) + 1).at n=15A103715
• Centuries whose prime pattern is the same as prime pattern in the previous century.at n=4A219996