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Divisibility and Sequence Properties of and
Sagar Mandal
Inspired by Lehmer's and Deaconescu's conjectures, as well as various analogue problems concerning Euler's totient function , Schemmel's totient function , Jordan t…
A Note on Deaconescu's Conjecture
Sagar Mandal
Hasanalizade [1] studied Deaconescu's conjecture for positive composite integer . A positive composite integer is said to be a Deaconescu number if .…
Exploring the Relationships Between the Divisors of Friends of
Sagar Mandal
A solitary number is a positive integer that shares its abundancy index only with itself. is the smallest positive integer suspected to be solitary, but no proof has been esta…
A note on solitary numbers
Sagar Mandal
Does have a friend? Until now, this has been an open question. In this note, we prove that a potential friend of is an odd, non-square positive integer. appears i…