In literature until today, many authors have studied special sequences in different number systems. In this paper, using the Leonardo numbers, we in- troduce the bicomplex Leonardo numbers. Also, we give some algebraic prop- erties of bicomplex Leonardo numbers such as recurrence relation, generating function, Binet's formula, D'Ocagne's identity, Cassini's identity, Catalan's identity and Honsberger identity.

In literature until today, many authors have studied special sequences in different number systems. In this paper, we have introduced the Oresme hybrid quaternion numbers. We give some properties and identities such as Binet's formula, generating function, norm and characteristic equation for these quaternions. Furthermore, matrix and determinant forms for these quaternion numbers are given.