A236548 - cp's OEIS frontend

A236548 Number of ways to write n = k^2 + m with k > 0 and m > 0 such that phi(k^2) + prime(m) is prime, where phi(.) is Euler's totient function.

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

[0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 3, 1, 0, 2, 2, 1, 2, 1, 0, 3, 0, 4, 1, 2, 1, 2, 2, 1, 2, 3, 3, 2, 1, 1, 2, 2, 2, 3, 4, 0, 2, 2, 4, 2, 1, 4, 3, 2, 2, 3, 3, 2, 1, 3, 2, 2, 5, 4, 3, 1, 0, 3, 4, 2, 1, 1, 3, 3, 2, 2, 2, 3, 3, 3, 5, 2, 3, 3, 2, 1, 4, 2, 4, 3, 4, 4, 3, 3, 3, 0]

cp's OEIS Frontend

A236548 Number of ways to write n = k^2 + m with k > 0 and m > 0 such that phi(k^2) + prime(m) is prime, where phi(.) is Euler's totient function.

Table of values

List of values

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

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

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