28605

Appears in sequences

• Number of nonprimes <= prime(n)^2.at n=40A053683
• Unary-binary representation of Stern polynomials: a(n) = A156552(A260443(n)).at n=45A277020
• Odd bisection of A277020: a(n) = A277020(2n+1).at n=22A277189
• Composite numbers k such that phi(k)^phi(k) == k + 1 (mod k^2).at n=2A319370