There is a sequence of 3, 7, 10, 17, 27, 44

Looking at the sequence, we can see that starting from the first number, the remainder divided by 5 is: 3, 2, 0, 2, 2, 4, 1, 0, 1, 1, 2, 3, 0, 3, 3, 1, 4, 0, 4, 4, *3, 2, 0, 2, 2, 4, 1, 0, ......Note that the sequence starts looping from the marker, and the number of items in the loop is 20. The equation can be obtained:

1998/20=99……18, then the remainder of the 1998th number divided by 5 is the 18th number 0 of the series. Just divisible.

First of all, it's similar"Fibonacci"The number series cannot be solved with the knowledge of the number series below the university.

Thirdly, a number ending in 0 or 5 must be divisible by 5, resulting in a number ending in x, then 05 and x-5 being the remainder.

The mantissa of each number in the summary question is:

It's not hard to get the results!

Divide the 3rd number by 5......0

The 6th number is divided by 5 ......4

It is inferred from this. The 9th number is divided by 5 ......3

The 18th number is divided by 5 ......0

It can be seen that starting from 3, every 15 numbers are divisible by 51995 15=133, which is exactly divisible.

So, the remainder of the 1998th number divided by 5 is 0

The remainder is zero. a1998=1996*a2+a1=13975

a1998)/5=2795

The remainder is zero.

This number is a general formula for the brigade column.

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Guess what is the next term of Zheng Lie 1,3,7,13,21,31,43,57?

Because, from term 2 onwards, each item has 2 more (n-1) than its previous term.

Answer] :d Analysis:

Therefore, the case of the assault and the shooting of the Ling Luda Wang Kong is D.

25-4) (7-4) Shed Scale +1

8 (terms) Answer: There are a total of 8 necklaces in this simple difference series

Summary. Hello, the answer is 3240.

By observing this equation, we can find that the difference between the two numbers is equal to 4, so it is an increasing sequence, and the law is 4n-1, so the 40th number is 4*40-1=159, and we can find that 3+159=7+155=11+151=.81 2, there are a total of 20 such equations, so the sum of the equations is 81 2 20 = 3240.

The main test of this question is that we first find the law to determine what the 40th number is, and then find the final sum according to the law.

There is a column of numbers 3, what is the sum of the first 40 numbers in this column?

Hello, I am Mr. Fang Tengfei! I have seen your question, and it will take 3 minutes to sort out the answer now, please wait a moment If my answer is helpful to you, please give it a thumbs up, thank you

Hello, the answer is 3240. By observing this equation, we can find that the difference between the two numbers is equal to 4, so it is an increasing sequence, and the law is 4n-1, so the 40th number is 4*40-1=159, and we can find that 3+159=7+155=11+151=.81 2, there are a total of 20 such equations, so the sum of the equations is 81 2 20 = 3240.

The main test of this question is that we first find the law to determine what the 40th number is, and then find the final sum according to the law. I hope I can help you, if you are satisfied, please give it a thumbs up, thank you. 殺

There is a number, the left is 3898, and the right is 400o, and how many hundreds are in the middle.

Hello, the answer is only 3900 and one is divisible by 100. If it's not the answer you want, please describe in detail what this number of hundreds means, so I can answer for you. 殺

According to the inscription: the nth number is (-1) n-1 (4n-1), then the number of this column or the 7th mountain and the number of yards are 27

So the answer is: 27

Observe that the difference between the first few numbers is 2, 5, 8, and 11 in turn, which is a series of equal differences with a tolerance of 3, so the difference between 27 and the following numbers is 14, 27+14=41.

+2+5+8+11 in turn, so the next +14 is 41

Rule: According to the 70253 cycle of dry tung, the 81st number: 81 5 =, after 16 cycles, the remainder is 1, that is, 70253, the first number of sales fails, that is, the loss of 7

The law of this sequence is that starting with the third number, the following number is the sum of the first two numbers. It is possible to follow this law and deduce the following numbers in this way.

This belongs to the rabbit sequence, that is, the sum of the first two numbers is equal to the next number: 3+7 equals 10, 7+10 equals 17 10+17 equals 27.

There is a column of numbers 3, 7, 10, 17, 27, 44, and the following is 71, 115, 186.... Its law is that the following number is the sum of the two numbers in front of it.