A233549 - cp's OEIS frontend

A233549 Number of ways to write n = p + q (q > 0) with p and (phi(p)*phi(q))^4 + 1 prime, where phi(.) is Euler's totient function (A000010).

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

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

cp's OEIS Frontend

A233549 Number of ways to write n = p + q (q > 0) with p and (phi(p)*phi(q))^4 + 1 prime, where phi(.) is Euler's totient function (A000010).

Table of values

List of values

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

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

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