MathDB

20

Part of 2018 India PRMO

Problems(1)

2018 preRMO p20, product of whose digits equals n^2 -15n -27

Source:

8/8/2019
Determine the sum of all possible positive integers n,n, the product of whose digits equals n2−15n−27n^2 -15n -27.
number theoryProductDigits