A330607 - cp's OEIS frontend

A330607 Array read by rows: T(n,k) is the number of solutions to the equation Sum_{i=1..n} x_i^2 == k (mod 5) with x_i in 0..4, where n >= 0 and 0 <= k <= 4.

n	a(n)
0	1
1	0
2	0
3	0
4	0
5	1
6	2
7	0
8	0
9	2
10	9
11	4
12	4
13	4
14	4
15	25
16	30
17	20
18	20
19	30
20	145
21	120
22	120
23	120
24	120
25	625
26	650
27	600
28	600
29	650
30	3225
31	3100
32	3100
33	3100
34	3100
35	15625
36	15750
37	15500
38	15500
39	15750
40	78625
41	78000
42	78000
43	78000
44	78000
45	390625
46	391250
47	390000
48	390000
49	391250
50	1955625
51	1952500
52	1952500
53	1952500
54	1952500

[1, 0, 0, 0, 0, 1, 2, 0, 0, 2, 9, 4, 4, 4, 4, 25, 30, 20, 20, 30, 145, 120, 120, 120, 120, 625, 650, 600, 600, 650, 3225, 3100, 3100, 3100, 3100, 15625, 15750, 15500, 15500, 15750, 78625, 78000, 78000, 78000, 78000, 390625, 391250, 390000, 390000, 391250, 1955625, 1952500, 1952500, 1952500, 1952500]

cp's OEIS Frontend

A330607 Array read by rows: T(n,k) is the number of solutions to the equation Sum_{i=1..n} x_i^2 == k (mod 5) with x_i in 0..4, where n >= 0 and 0 <= k <= 4.

Table of values

List of values