A234504 - cp's OEIS frontend

A234504 Number of ways to write n = k + m with k > 0 and m > 0 such that 2^(phi(k) + phi(m)/4) - 5 is prime, where phi(.) is Euler's totient function.

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

[0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 2, 1, 1, 3, 2, 3, 2, 3, 2, 3, 4, 5, 5, 4, 5, 6, 7, 4, 5, 6, 7, 6, 5, 7, 8, 5, 7, 9, 8, 8, 6, 8, 7, 10, 7, 10, 10, 9, 9, 8, 9, 10, 5, 10, 10, 9, 10, 10, 9, 10, 9, 7, 12, 14, 10, 9, 5, 11, 7, 13, 8, 13, 6, 9, 11, 11, 14, 15, 9, 13]

cp's OEIS Frontend

A234504 Number of ways to write n = k + m with k > 0 and m > 0 such that 2^(phi(k) + phi(m)/4) - 5 is prime, where phi(.) is Euler's totient function.

Table of values

List of values

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

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

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