A303821 - cp's OEIS frontend

A303821 Number of ways to write 2*n as p + 2^x + 5^y, where p is a prime, and x and y are nonnegative integers.

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

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

cp's OEIS Frontend

A303821 Number of ways to write 2*n as p + 2^x + 5^y, where p is a prime, and x and y are nonnegative integers.

Table of values

List of values

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

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

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