218117

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 30.at n=28A031618
• a(n) = 6*binomial(n,4) + 5*binomial(n,2) - 4*n + 5.at n=31A066455
• Prime numbersat n=19454