A friend of a number is another number such that is a friendly pair.
Friend
See also
Friendly Number, Friendly Pair, Solitary NumberExplore with Wolfram|Alpha
References
Anderson, C. W. and Hickerson, D. Problem 6020. "Friendly Integers." Amer. Math. Monthly 84, 65-66, 1977.Referenced on Wolfram|Alpha
FriendCite this as:
Weisstein, Eric W. "Friend." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Friend.html