A145190 - cp's OEIS frontend

A145190 Numbers k such that phi(1)phi(2)...*phi(k) / k is an integer, where phi(k) is the totient function (A000010).

n	a(n)
1	1
2	4
3	8
4	9
5	12
6	15
7	16
8	18
9	20
10	24
11	25
12	27
13	30
14	32
15	33
16	35
17	36
18	40
19	42
20	44
21	45
22	48
23	49
24	50
25	54
26	55
27	56
28	60
29	63
30	64
31	65
32	66
33	69
34	70
35	72
36	75
37	77
38	78
39	80
40	81
41	84
42	87
43	88
44	90
45	91
46	92
47	96
48	98
49	99
50	100
51	104
52	105
53	108
54	110
55	112
56	115
57	116
58	117
59	119
60	120
61	121
62	123

[1, 4, 8, 9, 12, 15, 16, 18, 20, 24, 25, 27, 30, 32, 33, 35, 36, 40, 42, 44, 45, 48, 49, 50, 54, 55, 56, 60, 63, 64, 65, 66, 69, 70, 72, 75, 77, 78, 80, 81, 84, 87, 88, 90, 91, 92, 96, 98, 99, 100, 104, 105, 108, 110, 112, 115, 116, 117, 119, 120, 121, 123]

cp's OEIS Frontend

A145190 Numbers k such that phi(1)phi(2)...*phi(k) / k is an integer, where phi(k) is the totient function (A000010).

Table of values

List of values

n	a(n)
1	1
2	4
3	8
4	9
5	12
6	15
7	16
8	18
9	20
10	24
11	25
12	27
13	30
14	32
15	33
16	35
17	36
18	40
19	42
20	44
21	45
22	48
23	49
24	50
25	54
26	55
27	56
28	60
29	63
30	64
31	65
32	66
33	69
34	70
35	72
36	75
37	77
38	78
39	80
40	81
41	84
42	87
43	88
44	90
45	91
46	92
47	96
48	98
49	99
50	100
51	104
52	105
53	108
54	110
55	112
56	115
57	116
58	117
59	119
60	120
61	121
62	123

n	a(n)
1	1
2	4
3	8
4	9
5	12
6	15
7	16
8	18
9	20
10	24
11	25
12	27
13	30
14	32
15	33
16	35
17	36
18	40
19	42
20	44
21	45
22	48
23	49
24	50
25	54
26	55
27	56
28	60
29	63
30	64
31	65
32	66
33	69
34	70
35	72
36	75
37	77
38	78
39	80
40	81
41	84
42	87
43	88
44	90
45	91
46	92
47	96
48	98
49	99
50	100
51	104
52	105
53	108
54	110
55	112
56	115
57	116
58	117
59	119
60	120
61	121
62	123

cp's OEIS Frontend

A145190 Numbers k such that phi(1)*phi(2)*...*phi(k) / k is an integer, where phi(k) is the totient function (A000010).

Table of values

List of values

A145190 Numbers k such that phi(1)phi(2)...*phi(k) / k is an integer, where phi(k) is the totient function (A000010).

n	a(n)
1	1
2	4
3	8
4	9
5	12
6	15
7	16
8	18
9	20
10	24
11	25
12	27
13	30
14	32
15	33
16	35
17	36
18	40
19	42
20	44
21	45
22	48
23	49
24	50
25	54
26	55
27	56
28	60
29	63
30	64
31	65
32	66
33	69
34	70
35	72
36	75
37	77
38	78
39	80
40	81
41	84
42	87
43	88
44	90
45	91
46	92
47	96
48	98
49	99
50	100
51	104
52	105
53	108
54	110
55	112
56	115
57	116
58	117
59	119
60	120
61	121
62	123