A262781 - cp's OEIS frontend

A262781 Number of ordered ways to write n as x^2 + phi(y^2) + phi(z^2) (x >= 0 and 0 < y <= z) with y or z prime, where phi(.) is Euler's totient function given by A000010.

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

[0, 0, 1, 2, 1, 0, 2, 3, 1, 1, 2, 3, 2, 3, 2, 2, 1, 3, 3, 1, 2, 3, 4, 1, 1, 3, 2, 3, 2, 4, 1, 3, 2, 2, 3, 1, 3, 3, 4, 2, 2, 3, 5, 5, 1, 4, 4, 4, 2, 6, 4, 4, 4, 6, 3, 4, 5, 4, 5, 4, 4, 3, 6, 4, 2, 3, 3, 5, 4, 4, 4, 3, 1, 4, 5, 4, 3, 6, 3, 1, 2, 3, 4, 4, 5, 5, 3, 3, 2, 8, 5, 3, 4, 2, 4, 4, 2, 3, 7, 2]

cp's OEIS Frontend

A262781 Number of ordered ways to write n as x^2 + phi(y^2) + phi(z^2) (x >= 0 and 0 < y <= z) with y or z prime, where phi(.) is Euler's totient function given by A000010.

Table of values

List of values

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

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

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