Cesàro means related to the square of the divisor function Gintautas Bareikis, Algirdas Mačiulis (2012) Acta Arithmetica
Composite positive integers with an average prime factor Florian Luca, Francesco Pappalardi (2007) Acta Arithmetica
Convoluted convolved Fibonacci numbers. Moree, Pieter (2004) Journal of Integer Sequences [electronic only]