MathDB

2

Part of 1978 Swedish Mathematical Competition

Problems(1)

s_1 + s_2 + ...+ s_ n if s_m is the number $66... 6$ with m digits 6

Source: 1978 Swedish Mathematical Competition p2

3/26/2021
Let sms_m be the number 66⋯666\cdots 6 with mm digits 66. Find s1+s2+⋯+sn s_1 + s_2 + \cdots + s_n
Sumnumber theoryDigitsalgebra