A308342 - cp's OEIS frontend

A308342 Number of ways to write 2*n as phi(x^2) + phi(y^2) + phi(z^2), where x,y,z are positive integers with x <= y <= z, and phi(.) is Euler's totient function (A000010).

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	2
8	2
9	2
10	2
11	3
12	3
13	2
14	2
15	2
16	2
17	3
18	3
19	1
20	2
21	3
22	4
23	4
24	3
25	4
26	5
27	4
28	6
29	5
30	5
31	5
32	5
33	5
34	5
35	4
36	5
37	4
38	4
39	2
40	5
41	5
42	3
43	6
44	6
45	3
46	7
47	6
48	6
49	6
50	5
51	6
52	6
53	4
54	5
55	5
56	5
57	5
58	6
59	4
60	5
61	8
62	7
63	5
64	9
65	6
66	7
67	8
68	8
69	7
70	6
71	6
72	8
73	5
74	7
75	7
76	6
77	5
78	6
79	8
80	8
81	8
82	10
83	6
84	10
85	13
86	10
87	10
88	9
89	6
90	11
91	9
92	7
93	3
94	9
95	6
96	6
97	9
98	7
99	5
100	12

[0, 1, 1, 1, 2, 1, 2, 2, 2, 2, 3, 3, 2, 2, 2, 2, 3, 3, 1, 2, 3, 4, 4, 3, 4, 5, 4, 6, 5, 5, 5, 5, 5, 5, 4, 5, 4, 4, 2, 5, 5, 3, 6, 6, 3, 7, 6, 6, 6, 5, 6, 6, 4, 5, 5, 5, 5, 6, 4, 5, 8, 7, 5, 9, 6, 7, 8, 8, 7, 6, 6, 8, 5, 7, 7, 6, 5, 6, 8, 8, 8, 10, 6, 10, 13, 10, 10, 9, 6, 11, 9, 7, 3, 9, 6, 6, 9, 7, 5, 12]

cp's OEIS Frontend

A308342 Number of ways to write 2*n as phi(x^2) + phi(y^2) + phi(z^2), where x,y,z are positive integers with x <= y <= z, and phi(.) is Euler's totient function (A000010).

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	2
8	2
9	2
10	2
11	3
12	3
13	2
14	2
15	2
16	2
17	3
18	3
19	1
20	2
21	3
22	4
23	4
24	3
25	4
26	5
27	4
28	6
29	5
30	5
31	5
32	5
33	5
34	5
35	4
36	5
37	4
38	4
39	2
40	5
41	5
42	3
43	6
44	6
45	3
46	7
47	6
48	6
49	6
50	5
51	6
52	6
53	4
54	5
55	5
56	5
57	5
58	6
59	4
60	5
61	8
62	7
63	5
64	9
65	6
66	7
67	8
68	8
69	7
70	6
71	6
72	8
73	5
74	7
75	7
76	6
77	5
78	6
79	8
80	8
81	8
82	10
83	6
84	10
85	13
86	10
87	10
88	9
89	6
90	11
91	9
92	7
93	3
94	9
95	6
96	6
97	9
98	7
99	5
100	12

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	2
8	2
9	2
10	2
11	3
12	3
13	2
14	2
15	2
16	2
17	3
18	3
19	1
20	2
21	3
22	4
23	4
24	3
25	4
26	5
27	4
28	6
29	5
30	5
31	5
32	5
33	5
34	5
35	4
36	5
37	4
38	4
39	2
40	5
41	5
42	3
43	6
44	6
45	3
46	7
47	6
48	6
49	6
50	5
51	6
52	6
53	4
54	5
55	5
56	5
57	5
58	6
59	4
60	5
61	8
62	7
63	5
64	9
65	6
66	7
67	8
68	8
69	7
70	6
71	6
72	8
73	5
74	7
75	7
76	6
77	5
78	6
79	8
80	8
81	8
82	10
83	6
84	10
85	13
86	10
87	10
88	9
89	6
90	11
91	9
92	7
93	3
94	9
95	6
96	6
97	9
98	7
99	5
100	12

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	2
8	2
9	2
10	2
11	3
12	3
13	2
14	2
15	2
16	2
17	3
18	3
19	1
20	2
21	3
22	4
23	4
24	3
25	4
26	5
27	4
28	6
29	5
30	5
31	5
32	5
33	5
34	5
35	4
36	5
37	4
38	4
39	2
40	5
41	5
42	3
43	6
44	6
45	3
46	7
47	6
48	6
49	6
50	5
51	6
52	6
53	4
54	5
55	5
56	5
57	5
58	6
59	4
60	5
61	8
62	7
63	5
64	9
65	6
66	7
67	8
68	8
69	7
70	6
71	6
72	8
73	5
74	7
75	7
76	6
77	5
78	6
79	8
80	8
81	8
82	10
83	6
84	10
85	13
86	10
87	10
88	9
89	6
90	11
91	9
92	7
93	3
94	9
95	6
96	6
97	9
98	7
99	5
100	12