A115230 - cp's OEIS frontend

A115230 Let p = prime(n); a(n) = number of ways to write p = 2^i + q^j where i >= 0, j >= 1, q = odd prime.

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	3
7	3
8	3
9	2
10	3
11	3
12	2
13	3
14	3
15	2
16	2
17	2
18	3
19	2
20	2
21	3
22	2
23	4
24	3
25	2
26	2
27	2
28	2
29	2
30	4
31	1
32	3
33	3
34	4
35	0
36	2
37	3
38	1
39	3
40	3
41	1
42	4
43	1
44	1
45	2
46	4
47	2
48	1
49	3
50	3
51	2
52	1
53	3
54	1
55	3
56	2
57	1
58	3
59	2
60	2
61	3
62	4
63	2
64	1
65	2
66	2
67	0
68	1
69	3
70	2
71	4
72	2
73	2
74	0
75	2
76	3
77	1
78	2
79	2
80	2
81	1
82	3
83	1
84	2
85	2
86	2
87	2
88	1
89	2
90	2
91	2
92	2
93	2
94	1
95	3
96	3
97	0
98	2
99	3
100	2
101	1
102	1
103	3
104	1
105	4

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

cp's OEIS Frontend

A115230 Let p = prime(n); a(n) = number of ways to write p = 2^i + q^j where i >= 0, j >= 1, q = odd prime.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	3
7	3
8	3
9	2
10	3
11	3
12	2
13	3
14	3
15	2
16	2
17	2
18	3
19	2
20	2
21	3
22	2
23	4
24	3
25	2
26	2
27	2
28	2
29	2
30	4
31	1
32	3
33	3
34	4
35	0
36	2
37	3
38	1
39	3
40	3
41	1
42	4
43	1
44	1
45	2
46	4
47	2
48	1
49	3
50	3
51	2
52	1
53	3
54	1
55	3
56	2
57	1
58	3
59	2
60	2
61	3
62	4
63	2
64	1
65	2
66	2
67	0
68	1
69	3
70	2
71	4
72	2
73	2
74	0
75	2
76	3
77	1
78	2
79	2
80	2
81	1
82	3
83	1
84	2
85	2
86	2
87	2
88	1
89	2
90	2
91	2
92	2
93	2
94	1
95	3
96	3
97	0
98	2
99	3
100	2
101	1
102	1
103	3
104	1
105	4

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	3
7	3
8	3
9	2
10	3
11	3
12	2
13	3
14	3
15	2
16	2
17	2
18	3
19	2
20	2
21	3
22	2
23	4
24	3
25	2
26	2
27	2
28	2
29	2
30	4
31	1
32	3
33	3
34	4
35	0
36	2
37	3
38	1
39	3
40	3
41	1
42	4
43	1
44	1
45	2
46	4
47	2
48	1
49	3
50	3
51	2
52	1
53	3
54	1
55	3
56	2
57	1
58	3
59	2
60	2
61	3
62	4
63	2
64	1
65	2
66	2
67	0
68	1
69	3
70	2
71	4
72	2
73	2
74	0
75	2
76	3
77	1
78	2
79	2
80	2
81	1
82	3
83	1
84	2
85	2
86	2
87	2
88	1
89	2
90	2
91	2
92	2
93	2
94	1
95	3
96	3
97	0
98	2
99	3
100	2
101	1
102	1
103	3
104	1
105	4

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	3
7	3
8	3
9	2
10	3
11	3
12	2
13	3
14	3
15	2
16	2
17	2
18	3
19	2
20	2
21	3
22	2
23	4
24	3
25	2
26	2
27	2
28	2
29	2
30	4
31	1
32	3
33	3
34	4
35	0
36	2
37	3
38	1
39	3
40	3
41	1
42	4
43	1
44	1
45	2
46	4
47	2
48	1
49	3
50	3
51	2
52	1
53	3
54	1
55	3
56	2
57	1
58	3
59	2
60	2
61	3
62	4
63	2
64	1
65	2
66	2
67	0
68	1
69	3
70	2
71	4
72	2
73	2
74	0
75	2
76	3
77	1
78	2
79	2
80	2
81	1
82	3
83	1
84	2
85	2
86	2
87	2
88	1
89	2
90	2
91	2
92	2
93	2
94	1
95	3
96	3
97	0
98	2
99	3
100	2
101	1
102	1
103	3
104	1
105	4