MathDB

M2549

Part of Kvant 2019

Problems(1)

Sum of n-digit numbers with decreasing digits

Source: Kvant Magazine No. 2 2019 M2549

3/14/2023
For each non-negative integer nn find the sum of all nn-digit numbers with the digits in a decreasing sequence.
[I]Proposed by P. Kozhevnikov[/I]
number theoryKvant