2159135

Appears in sequences

• a(n) = ((5 + 2*sqrt(2))*(1 + sqrt(2))^n + (5 - 2*sqrt(2))*(1 - sqrt(2))^n)/2.at n=15A163607
• Numbers n such that (ceiling(sqrt(n*n/2)))^2 - n*n/2 = 17/2.at n=14A175033