A341938 - cp's OEIS frontend

A341938 Numbers m such that the geometric mean of tau(m) and phi(m) is an integer where phi is the Euler totient function (A000010) and tau is the number of divisors function (A000005).

n	a(n)
1	1
2	3
3	8
4	10
5	18
6	19
7	24
8	30
9	34
10	45
11	52
12	54
13	57
14	73
15	74
16	85
17	102
18	125
19	135
20	140
21	152
22	153
23	156
24	163
25	182
26	185
27	190
28	202
29	219
30	222
31	252
32	255
33	333
34	342
35	360
36	375
37	394
38	416
39	420
40	436
41	451
42	455
43	456
44	459
45	476
46	489
47	505
48	514
49	546
50	555
51	570
52	584
53	606
54	625
55	629
56	640
57	646
58	679
59	680
60	730

[1, 3, 8, 10, 18, 19, 24, 30, 34, 45, 52, 54, 57, 73, 74, 85, 102, 125, 135, 140, 152, 153, 156, 163, 182, 185, 190, 202, 219, 222, 252, 255, 333, 342, 360, 375, 394, 416, 420, 436, 451, 455, 456, 459, 476, 489, 505, 514, 546, 555, 570, 584, 606, 625, 629, 640, 646, 679, 680, 730]

cp's OEIS Frontend

A341938 Numbers m such that the geometric mean of tau(m) and phi(m) is an integer where phi is the Euler totient function (A000010) and tau is the number of divisors function (A000005).

Table of values

List of values

n	a(n)
1	1
2	3
3	8
4	10
5	18
6	19
7	24
8	30
9	34
10	45
11	52
12	54
13	57
14	73
15	74
16	85
17	102
18	125
19	135
20	140
21	152
22	153
23	156
24	163
25	182
26	185
27	190
28	202
29	219
30	222
31	252
32	255
33	333
34	342
35	360
36	375
37	394
38	416
39	420
40	436
41	451
42	455
43	456
44	459
45	476
46	489
47	505
48	514
49	546
50	555
51	570
52	584
53	606
54	625
55	629
56	640
57	646
58	679
59	680
60	730

n	a(n)
1	1
2	3
3	8
4	10
5	18
6	19
7	24
8	30
9	34
10	45
11	52
12	54
13	57
14	73
15	74
16	85
17	102
18	125
19	135
20	140
21	152
22	153
23	156
24	163
25	182
26	185
27	190
28	202
29	219
30	222
31	252
32	255
33	333
34	342
35	360
36	375
37	394
38	416
39	420
40	436
41	451
42	455
43	456
44	459
45	476
46	489
47	505
48	514
49	546
50	555
51	570
52	584
53	606
54	625
55	629
56	640
57	646
58	679
59	680
60	730

n	a(n)
1	1
2	3
3	8
4	10
5	18
6	19
7	24
8	30
9	34
10	45
11	52
12	54
13	57
14	73
15	74
16	85
17	102
18	125
19	135
20	140
21	152
22	153
23	156
24	163
25	182
26	185
27	190
28	202
29	219
30	222
31	252
32	255
33	333
34	342
35	360
36	375
37	394
38	416
39	420
40	436
41	451
42	455
43	456
44	459
45	476
46	489
47	505
48	514
49	546
50	555
51	570
52	584
53	606
54	625
55	629
56	640
57	646
58	679
59	680
60	730