A341621 - cp's OEIS frontend

A341621 a(n) is the exponent of the least power of 2 that when multiplied by n makes the product abundant, or -1 if n itself is a power of 2.

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

[-1, -1, 2, -1, 2, 1, 3, -1, 1, 1, 3, 0, 3, 2, 1, -1, 4, 0, 4, 0, 1, 2, 4, 0, 2, 2, 1, 1, 4, 0, 5, -1, 1, 3, 1, 0, 5, 3, 1, 0, 5, 0, 5, 1, 1, 3, 5, 0, 2, 1, 1, 1, 5, 0, 2, 0, 1, 3, 5, 0, 5, 4, 1, -1, 2, 0, 6, 2, 1, 0, 6, 0, 6, 4, 1, 2, 2, 0, 6, 0, 1, 4, 6, 0, 2, 4, 1, 0, 6, 0, 2, 2, 1, 4, 2, 0, 6, 1, 1, 0, 6, 0, 6, 0, 1]

cp's OEIS Frontend

A341621 a(n) is the exponent of the least power of 2 that when multiplied by n makes the product abundant, or -1 if n itself is a power of 2.

Table of values

List of values

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

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

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