164057

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 27.at n=29A031615
• a(1) = 2, a(n+1) is the smallest prime greater than n*a(n).at n=8A077213
• a(n) = Sum_{k=1..n-1} k^2*phi(k) + n^2*phi(n)/2, where phi = A000010.at n=30A333293
• Prime numbersat n=15021