There is a column of numbers arranged into 5, - 15,45, - 135405 according to a certain rule. The sum of some three adjacent numbers is 2835, which means What are the three numbers

There is a column of numbers arranged into 5, - 15,45, - 135405 according to a certain rule. The sum of some three adjacent numbers is 2835, which means What are the three numbers

Let the first of the three numbers be X
Then x-3x + 9x = 2835
x=405
So the three numbers are 405, - 1215 (405 * (- 3)), 3645 (405 * 9)

A column of numbers 1.1.2.4.7.13.24.44.81. The fourth number, each number is the sum of the first three numbers, 1001 is odd or even

Odd even cycles
1001/4=250…… one
So 1001 is odd

1.1.2.4.7.13.24.44.81. Starting from the fourth number, each number is related to the three numbers before it, so is the 100th odd or even

Odd, even, odd, even
100/4=25
There is no remainder, so it is even

There is a column of numbers 1.1.2.4.7.13.24.44.81. Starting from the fourth number, each number is the sum of the three numbers in front of it, then is the number 2012 odd or not
even numbers?

2012 = 0 so even

1,1,2,4,7,13,24,44,81. Starting from the fourth number, each number is the sum of its first three numbers, and is the 2012 number odd or even

11001100 cycle, the 2012 positive even number