20346159

Appears in sequences

• Generalized Pellian with second term equal to 7.at n=18A048694
• a(n) = 6*a(n-1) - a(n-2) for n > 1; a(0) = 1, a(1) = 15.at n=9A164541
• Numbers n such that (ceiling(sqrt(n*n/2)))^2 - n*n/2 = 17/2.at n=17A175033