A054021 - cp's OEIS frontend

A054021 Numbers n such that Chowla's function of n is divisible by the number of proper divisors of n.

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	11
8	12
9	13
10	14
11	17
12	18
13	19
14	23
15	24
16	26
17	27
18	29
19	31
20	32
21	35
22	37
23	38
24	40
25	41
26	43
27	47
28	52
29	53
30	56
31	59
32	61
33	62
34	63
35	65
36	66
37	67
38	71
39	73
40	74
41	77
42	79
43	83
44	86
45	88
46	89
47	90
48	92
49	95
50	97
51	101
52	103
53	104
54	107
55	109
56	110
57	112
58	113
59	119
60	122
61	125
62	127
63	128
64	131
65	134
66	136

[2, 3, 4, 5, 7, 8, 11, 12, 13, 14, 17, 18, 19, 23, 24, 26, 27, 29, 31, 32, 35, 37, 38, 40, 41, 43, 47, 52, 53, 56, 59, 61, 62, 63, 65, 66, 67, 71, 73, 74, 77, 79, 83, 86, 88, 89, 90, 92, 95, 97, 101, 103, 104, 107, 109, 110, 112, 113, 119, 122, 125, 127, 128, 131, 134, 136]

cp's OEIS Frontend

A054021 Numbers n such that Chowla's function of n is divisible by the number of proper divisors of n.

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	11
8	12
9	13
10	14
11	17
12	18
13	19
14	23
15	24
16	26
17	27
18	29
19	31
20	32
21	35
22	37
23	38
24	40
25	41
26	43
27	47
28	52
29	53
30	56
31	59
32	61
33	62
34	63
35	65
36	66
37	67
38	71
39	73
40	74
41	77
42	79
43	83
44	86
45	88
46	89
47	90
48	92
49	95
50	97
51	101
52	103
53	104
54	107
55	109
56	110
57	112
58	113
59	119
60	122
61	125
62	127
63	128
64	131
65	134
66	136

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	11
8	12
9	13
10	14
11	17
12	18
13	19
14	23
15	24
16	26
17	27
18	29
19	31
20	32
21	35
22	37
23	38
24	40
25	41
26	43
27	47
28	52
29	53
30	56
31	59
32	61
33	62
34	63
35	65
36	66
37	67
38	71
39	73
40	74
41	77
42	79
43	83
44	86
45	88
46	89
47	90
48	92
49	95
50	97
51	101
52	103
53	104
54	107
55	109
56	110
57	112
58	113
59	119
60	122
61	125
62	127
63	128
64	131
65	134
66	136

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	11
8	12
9	13
10	14
11	17
12	18
13	19
14	23
15	24
16	26
17	27
18	29
19	31
20	32
21	35
22	37
23	38
24	40
25	41
26	43
27	47
28	52
29	53
30	56
31	59
32	61
33	62
34	63
35	65
36	66
37	67
38	71
39	73
40	74
41	77
42	79
43	83
44	86
45	88
46	89
47	90
48	92
49	95
50	97
51	101
52	103
53	104
54	107
55	109
56	110
57	112
58	113
59	119
60	122
61	125
62	127
63	128
64	131
65	134
66	136