A277707 - cp's OEIS frontend

A277707 a(n) = index of the least prime divisor of n which has an odd exponent, or 0 if n is a perfect square.

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

[0, 1, 2, 0, 3, 1, 4, 1, 0, 1, 5, 2, 6, 1, 2, 0, 7, 1, 8, 3, 2, 1, 9, 1, 0, 1, 2, 4, 10, 1, 11, 1, 2, 1, 3, 0, 12, 1, 2, 1, 13, 1, 14, 5, 3, 1, 15, 2, 0, 1, 2, 6, 16, 1, 3, 1, 2, 1, 17, 2, 18, 1, 4, 0, 3, 1, 19, 7, 2, 1, 20, 1, 21, 1, 2, 8, 4, 1, 22, 3, 0, 1, 23, 2, 3, 1, 2, 1, 24, 1, 4, 9, 2, 1, 3, 1, 25, 1, 5, 0, 26, 1, 27, 1, 2]

cp's OEIS Frontend

A277707 a(n) = index of the least prime divisor of n which has an odd exponent, or 0 if n is a perfect square.

Table of values

List of values

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

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

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