4541160

Appears in sequences

• Numbers k such that k+1 and 3*k+1 are perfect squares.at n=6A045899
• For n > 5, a(n) = 15*a(n-1) - 15*a(n-2) + a(n-3); initial terms are 1, 3, 8, 120, 1680.at n=7A051047
• a(n) = 3*a(n-1) + 3*a(n-2) - a(n-3); a(0) = 1, a(1) = 0, a(2) = 3. a(n) = 4*{a(n-1)+(-1)^n}-a(n-2); a(0) = 1, a(1) = 0.at n=13A120892
• Denominators a(n) of Pythagorean approximations b(n)/a(n) to sqrt(3).at n=11A195499