A341939 - cp's OEIS frontend

A341939 Numbers m such that phi(m)/tau(m) is a square of 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	57
13	73
14	74
15	85
16	102
17	125
18	135
19	140
20	152
21	153
22	156
23	163
24	182
25	185
26	190
27	202
28	219
29	222
30	252
31	255
32	333
33	342
34	360
35	375
36	394
37	416
38	420
39	436
40	451
41	455
42	456
43	459
44	476
45	489
46	505
47	514
48	546
49	555
50	570
51	584
52	606
53	625
54	629
55	640
56	646
57	679
58	680
59	730

[1, 3, 8, 10, 18, 19, 24, 30, 34, 45, 52, 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

A341939 Numbers m such that phi(m)/tau(m) is a square of 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	57
13	73
14	74
15	85
16	102
17	125
18	135
19	140
20	152
21	153
22	156
23	163
24	182
25	185
26	190
27	202
28	219
29	222
30	252
31	255
32	333
33	342
34	360
35	375
36	394
37	416
38	420
39	436
40	451
41	455
42	456
43	459
44	476
45	489
46	505
47	514
48	546
49	555
50	570
51	584
52	606
53	625
54	629
55	640
56	646
57	679
58	680
59	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	57
13	73
14	74
15	85
16	102
17	125
18	135
19	140
20	152
21	153
22	156
23	163
24	182
25	185
26	190
27	202
28	219
29	222
30	252
31	255
32	333
33	342
34	360
35	375
36	394
37	416
38	420
39	436
40	451
41	455
42	456
43	459
44	476
45	489
46	505
47	514
48	546
49	555
50	570
51	584
52	606
53	625
54	629
55	640
56	646
57	679
58	680
59	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	57
13	73
14	74
15	85
16	102
17	125
18	135
19	140
20	152
21	153
22	156
23	163
24	182
25	185
26	190
27	202
28	219
29	222
30	252
31	255
32	333
33	342
34	360
35	375
36	394
37	416
38	420
39	436
40	451
41	455
42	456
43	459
44	476
45	489
46	505
47	514
48	546
49	555
50	570
51	584
52	606
53	625
54	629
55	640
56	646
57	679
58	680
59	730