158600

Appears in sequences

• The common value of sigma_2 for square-amicable numbers, sigma_2(m)=sigma_2(n), m<n.at n=28A110929
• G.f.: A(x) = 1/(1 - x*B(x^2)), where B(x) = Sum_{n>=0} a(n)^2*x^n is the g.f. of A121648.at n=22A121649
• A bisection of A121649; a(n) = A121649(2*n) = A121648(2*n)^(1/2).at n=11A121650
• a(n) = sigma_2(n)*Fibonacci(n), where sigma_2(n) = A001157(n), the sum of squares of divisors of n.at n=14A203849