1347905domain: NAppears in sequencesNumbers that divide the average of the sum of the squares of their divisors.at n=17A255244Numbers that divide the average of the squares of their aliquot parts.at n=11A255245a(n) = Fibonacci(n-1) * Fibonacci(n+1) * Fibonacci(2*n-1) * Fibonacci(2*n+1).at n=5A375803