Two different numbers a, b which satisfy sigma(a)=sigma(b)=(a+b)^3/(a^2+b^2) are called a rational amicable pair; sequence gives b numbers.

A038363

Two different numbers a, b which satisfy sigma(a)=sigma(b)=(a+b)^3/(a^2+b^2) are called a rational amicable pair; sequence gives b numbers.