A064989 - cp's OEIS frontend

A064989 Multiplicative with a(2^e) = 1 and a(p^e) = prevprime(p)^e for odd primes p.

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

[1, 1, 2, 1, 3, 2, 5, 1, 4, 3, 7, 2, 11, 5, 6, 1, 13, 4, 17, 3, 10, 7, 19, 2, 9, 11, 8, 5, 23, 6, 29, 1, 14, 13, 15, 4, 31, 17, 22, 3, 37, 10, 41, 7, 12, 19, 43, 2, 25, 9, 26, 11, 47, 8, 21, 5, 34, 23, 53, 6, 59, 29, 20, 1, 33, 14, 61, 13, 38, 15, 67, 4, 71, 31, 18, 17, 35, 22, 73, 3, 16]

cp's OEIS Frontend

A064989 Multiplicative with a(2^e) = 1 and a(p^e) = prevprime(p)^e for odd primes p.

Table of values

List of values

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

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

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