Write a general formula of the following sequence: 1, 0, - 13, 0, 15, 0, - 17, 0
When n is even, an = 0; when n is odd, if n = 4K + 1, then an = (- 1) n + 1 · 1n; if n = 4K + 3, then an = (- 1) n · 1n (K ∈ n)
RELATED INFORMATIONS
- 1. 5,0,5,0,5, what is the general formula of this series? What is the general term formula of 5,0,5,0,5,0?
- 2. General term formula of sequence 2.5.2.5
- 3. Give a sequence how to quickly know its general formula, is there a rule I feel that it needs more feeling than painting color, that is, to make up the number. Although it can be made, it always takes some time. Why?
- 4. -1、8/5、-17/5、24/9、-35/11、48/13…… What is the tenth term in the sequence?
- 5. The number of one column is - (1), 8 / 5, - (15 / 7), 24 / 9, - (35 / 11), 48 / 13 What is the twentieth term in this sequence?
- 6. Observe a column number, 3, 8, 15, 24, 35, 48 And so on, what is the smallest integer larger than 2010 in this series?
- 7. Observe the number of columns 3, 8, 15, 24, 35, 48 By analogy, the smallest integer larger than 2014 in this sequence is
- 8. Observe the sequence of numbers: 1, 3, 6, 10, 15, 21... According to the sequence of numbers in this column, what is the nth number?
- 9. 1, - 3,5, - 7,9, - 11... In this sequence, if the nth number is a, what is the nth + 1 number?
- 10. Write the general term formula of sequence 1 / 2,1 / 4, - 5 / 8,13 / 16, - 29 / 32,61 / 64
- 11. Observe the characteristics of the following sequence, fill in the blanks with appropriate numbers, and write a general formula for each sequence 1.( ),-4,9,( ),25,( ),49 1, radical 2, (), 2, radical 5, (), radical 7 ------------------ How to write this,
- 12. Find the rule and write the general formula of each sequence * 3 1,2/3,1/2,2/5,1/3,( ),1/4,... 3/2,1,5/8,3/8,7/32,... 1,3,7,15,31,..
- 13. Observation - what is the nth number of 1,2,7,14,23,34 rule
- 14. Observe the numbers - 1, 2, 7, 14, 23, 34 According to this law, the nth number is______ .
- 15. Observation sequence - 2, - 1,2,7,14,23 According to this rule, what is the nth number?
- 16. Observe the sequence and complete it: 1, 3, 8, 22, 60, (), 48
- 17. Sequence problems 3,5,22,42,83, ()
- 18. Urgent, there is a sequence, 4.10.16.22... 52. How many items are there in this sequence
- 19. The sum of the first term and the fourth term of an arithmetic sequence is equal to 10, while the difference between the second term and the third term is equal to 2?
- 20. What is the law of filling in the blanks in the sequence problem? The first sequence is 16,27,16, (), 1 The second sequence 6,8,28,36, () The third 8,9,34129, ()