Given the sum of the first n terms of the sequence an, Sn = an + n & # 178; - 1 (n ∈ n *) find the general term formula of the sequence an (1) (2) if BN = 1 / ana (n + 1), find the sum of the first n terms of the sequence BN

RELATED INFORMATIONS

• 1. Given that the sum of the first n terms of the sequence {an} is Sn = n & # 178; + N + 1, then the general term formula of {an} is?
• 2. Given that the sum of the first n terms of the sequence {an} is Sn = n & # 178; + n & # 189; N, find the general term formula of the sequence
• 3. Given the general term formula of sequence {an} an = n & # 178; + N, then the first n terms of {an} and Sn =?
• 4. 1. Given the first n terms of a sequence and Sn = n square + n-1, is it an arithmetic sequence?
• 5. It is known that the sum of the first n terms of the sequence is Sn = n2-3n + 1, (1) find the general term formula, (2) try to judge whether the sequence an is an arithmetic sequence
• 6. It is known that the sum of the first n terms of a sequence is Sn = N2 + 3N, and it is proved that {an} is an arithmetic sequence. What if Sn = N2 + 3N + 1?
• 7. Given the first n terms of the arithmetic sequence {an} and Sn = - 2n2-n, how to find the expression of the general term an? Sn-1 = - 2 (n-1) & # 178; - (n-1) are calculated?
• 8. Every item of sequence an is a positive number, and Sn is the sum of its first n terms. For any n which belongs to a positive integer, there is always an, Sn, an & # 178; a general formula for finding an in arithmetic sequence Let BN = an (1 / 2) &# 178; the sum of the first n terms of BN is TN, and prove that 1 / 2 ≤ TN ≤ 2
• 9. The first n terms of the sequence {an} and Sn = 2n & # 178; + n-1, then the general term formula of the sequence is? How is the process solved?
• 10. (1) Given that the sum of the first n terms of the sequence an is Sn, satisfying Sn = an & # 178; + BN, it is proved that an is an arithmetic sequence (2) It is known that the sum of the first n terms of the arithmetic sequence an is Sn, and it is proved that Sn / N is also an arithmetic sequence
• 11. Given the first n terms and Sn = 3 (3 ^ n + 1) / 2 of the sequence, find its general term formula
• 12. Given that the sum of the first n terms of sequence {an} is Sn = 2n-3, then the general term formula of sequence a is (2n, n is above)
• 13. Given the sum of the first n terms of the sequence {an} Sn = - 3 / 2n & sup2; + 205 / 2n, find the general term formula of the sequence {an}
• 14. It is known that the sum of the first n terms of the sequence is Sn = - 3 / 2n square + 205 / 2n 1, find the general term formula, 2, find the sum of the first n terms TN
• 15. Given A1 = 1, a (n + 1) = 3an + 2 ^ (n + 1), find the general term formula of sequence {an}
• 16. A 1 = 3, a (n + 1) = 3an - 2 fast
• 17. The general term formula of sequence is 2n ^ 2-2n + 1, and the sum of the first n terms can be obtained
• 18. Given the first n terms of the sequence {an} and Sn = n ^ 2 + 2n (1), find the general term formula of the sequence {an} (2), find the 10th term of the sequence
• 19. Known: known 1 + 3 = 4 = 2,1 + 3 + 5 = 9 = 3,1 + 3 + 5 + 7 = 16 = 4, then 1 + 3 + 5 + + (2n + 1) = (n + 1) 1+3+5+… +(2n + 1) how to see that there are n + 1 items, list a process for me to see
• 20. Try to explain: for any natural number n, the value of n (n + 5) - (n-3) (n + 2) can be divided by 6