On Numbers in Medial Progression

A sequence of numbers a_l= a_2, a_3, • a_n,••• is said to be in Medial Progression (M.P.)

if a_r = a_{r_1} +a_r-2 [r≥3]. … (1)

Throughout this paper which develops properties of such a progression, the numbers a_n will be supposed to be positive or negative integers.