458280

Appears in sequences

• Numbers k such that sum of divisors of k^2 is a square.at n=28A008847
• a(n) can be expressed as the difference of the squares of consecutive primes in just three distinct ways.at n=23A090783
• Real parts of the recursive sequence a(n+2) = Sum_{k=0..n} binomial(n,k)*a(k)*a(n+1-k), with a(0)=1, a(1)=2i.at n=10A289086