3544695

Appears in sequences

• Numbers n such that sigma(n) = m*sigma(n+2) with some m > 1.at n=22A260988
• a(n) = H(n-1, n, n+1) where H(a, b, c) = (a + b + c)*(a + b - c)*(b + c - a)*(c + a - b) is Heron's polynomial.at n=33A339488