What is the law of sequence 1,4,9,25

The nth number is n * n

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1. In sequence 1.4.9.16.25.36 What's the 79th number in In sequence 1.4.9.16.25.36 What's the 79th number in? The fourth grade of primary school
2. Sequence 1.3.9.15.21. The nth number is
3. The sum formula of 2N-1 and 2n + 1 natural numbers
4. What is the formula of whole column summation or whole row summation in excel? How to find the average?
5. How to find the sum of reciprocal squares of natural numbers?
6. Ask for the sum of the reciprocal sequence of natural numbers, 1+1/2+1/3+1/4+ … +Sum of reciprocal sequence of 1 / n natural numbers And 1 + 1 / (2 * 2) + 1 / (3 * 3) + 1 / (4 * 4) + +Sum of reciprocal square sequence of 1 / (n * n) natural number ～ Many people say it can't be solved Another point I ask is the sum of the first n terms, not the limit. But others say it's →∞ I don't understand why the sequence 2481632... 2yn is also →∞, but the sum of the first n terms can be obtained?
7. The square of X + 4xy + 4Y is equal to? (factorization)
8. Hello: how about X (X-Y) ^ 2-y (Y-X) ^ 2 x ^ 2 / 4 + XY + y ^ 2 using the square difference formula?
9. Can the square of x plus 2, the square of XY plus y be calculated by the complete square formula
10. (1, 2, 3, 4. N) how many logarithms of vertex angle are there when the lines intersect at a point? What is the law? Online, etc
11. The sum of the first n terms of sequence 3 / 2,9 / 4,13 / 4,65 / 16 is___
12. The sum of the first n terms of sequence 1 / 29 / 4 25 / 8 65 / 16
13. The first four terms of sequence {an} are 3 / 2,9 / 4,25 / 8,65 / 16. Try to find the general term formula and the sum of the first n terms
14. Sequence {1,1 / 4,1 / 9 , 1 / N ^ 2}, how to sum
15. Sum 0.9 + 0.99 + 0.999 + 0.9999 + +0.99999…… 9 (n 9S) this is in the sequence
16. K2 = λ + 1 / λ - 2,4 ≤ λ ≤ 9.k2? Find the specific process
17. How to sum arithmetic sequence
18. Asking for help -- the problem of summation of arithmetic sequence Given that the tolerance of the arithmetic sequence {an} is 1, and a1 + A2 +... + A98 + A99 = 99, then the value of A3 + A6 + A9 +... + A99 is_____
19. Summation of arithmetic sequence 1/1+1/(1+2)+1/(1+2+3).+1/(1+2+3+..N)
20. Summation of arithmetic sequence In the arithmetic sequence {an}, a1 + A2 + a3 + A4 = 68, A6 + A7 + A8 + A9 + A10 = 30, then the sum from A15 to A30 is______ .