MathDB

1

Part of 2006 Hanoi Open Mathematics Competitions

Problems(2)

last 2 digits of the (11 + 12 + 13 + ... + 2006)^2 (HOMC 2006 J Q1)

Source:

7/23/2019
What is the last two digits of the number (11+12+13+...+2006)2(11 + 12 + 13 + ... + 2006)^2?
number theoryDigits
What is the last three digits of the sum

Source:

1/24/2016
What is the last three digits of the sum 11! + 12! + 13! +    + 2006!