A308658 - cp's OEIS frontend

A308658 Square array read by downward antidiagonals: A(n, k) is the number of primes between the n-th and (n+k)-th perfect powers with exponent > 1, k > 0.

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

[2, 4, 2, 4, 2, 0, 6, 4, 2, 2, 9, 7, 5, 5, 3, 9, 7, 5, 5, 3, 0, 11, 9, 7, 7, 5, 2, 2, 11, 9, 7, 7, 5, 2, 2, 0, 15, 13, 11, 11, 9, 6, 6, 4, 4, 18, 16, 14, 14, 12, 9, 9, 7, 7, 3, 22, 20, 18, 18, 16, 13, 13, 11, 11, 7, 4, 25, 23, 21, 21, 19, 16, 16, 14, 14, 10, 7]

cp's OEIS Frontend

A308658 Square array read by downward antidiagonals: A(n, k) is the number of primes between the n-th and (n+k)-th perfect powers with exponent > 1, k > 0.

Table of values

List of values

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

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

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