A322981 - cp's OEIS frontend

A322981 If n is the k-th prime power > 1, a(n) = k, otherwise a(n) = 0.

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

[0, 1, 2, 3, 4, 0, 5, 6, 7, 0, 8, 0, 9, 0, 0, 10, 11, 0, 12, 0, 0, 0, 13, 0, 14, 0, 15, 0, 16, 0, 17, 18, 0, 0, 0, 0, 19, 0, 0, 0, 20, 0, 21, 0, 0, 0, 22, 0, 23, 0, 0, 0, 24, 0, 0, 0, 0, 0, 25, 0, 26, 0, 0, 27, 0, 0, 28, 0, 0, 0, 29, 0, 30, 0, 0, 0, 0, 0, 31, 0, 32, 0, 33, 0, 0, 0, 0, 0, 34, 0, 0, 0, 0, 0, 0, 0, 35]

cp's OEIS Frontend

A322981 If n is the k-th prime power > 1, a(n) = k, otherwise a(n) = 0.

Table of values

List of values

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

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

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