90020

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 30.at n=19A031708
• a(n) = 225*n^2 + n.at n=19A156814
• a(n) = 900*n^2 + 2*n.at n=9A158406
• a(n) = 400*n^2 + 20.at n=15A158601