Gachimu, R. K.; Mwathi, C. W.; Kamuti, I. N.
(Journal of Agricultural Science and Technology, JKUAT, 2017-01-18)
This paper sets out to, systematically, use properties of the abundancy index
function to prove that a friend of 38 must be an odd non-square multiple of 19
which is not divisible by 3, and that every prime factor ...