A129827 - cp's OEIS frontend

A129827 Numbers k such that Euler's totient phi(k) divided by 2 is a perfect square.

n	a(n)
1	3
2	4
3	6
4	15
5	16
6	19
7	20
8	24
9	27
10	30
11	38
12	51
13	54
14	64
15	68
16	73
17	80
18	91
19	95
20	96
21	102
22	111
23	117
24	120
25	135
26	146
27	148
28	152
29	163
30	182
31	190
32	216
33	222
34	228
35	234
36	243
37	252
38	255
39	256
40	270
41	272
42	275
43	303
44	320
45	323
46	326
47	340
48	365
49	375
50	384
51	404
52	408
53	455
54	459
55	480
56	486
57	500

[3, 4, 6, 15, 16, 19, 20, 24, 27, 30, 38, 51, 54, 64, 68, 73, 80, 91, 95, 96, 102, 111, 117, 120, 135, 146, 148, 152, 163, 182, 190, 216, 222, 228, 234, 243, 252, 255, 256, 270, 272, 275, 303, 320, 323, 326, 340, 365, 375, 384, 404, 408, 455, 459, 480, 486, 500]

cp's OEIS Frontend

A129827 Numbers k such that Euler's totient phi(k) divided by 2 is a perfect square.

Table of values

List of values

n	a(n)
1	3
2	4
3	6
4	15
5	16
6	19
7	20
8	24
9	27
10	30
11	38
12	51
13	54
14	64
15	68
16	73
17	80
18	91
19	95
20	96
21	102
22	111
23	117
24	120
25	135
26	146
27	148
28	152
29	163
30	182
31	190
32	216
33	222
34	228
35	234
36	243
37	252
38	255
39	256
40	270
41	272
42	275
43	303
44	320
45	323
46	326
47	340
48	365
49	375
50	384
51	404
52	408
53	455
54	459
55	480
56	486
57	500

n	a(n)
1	3
2	4
3	6
4	15
5	16
6	19
7	20
8	24
9	27
10	30
11	38
12	51
13	54
14	64
15	68
16	73
17	80
18	91
19	95
20	96
21	102
22	111
23	117
24	120
25	135
26	146
27	148
28	152
29	163
30	182
31	190
32	216
33	222
34	228
35	234
36	243
37	252
38	255
39	256
40	270
41	272
42	275
43	303
44	320
45	323
46	326
47	340
48	365
49	375
50	384
51	404
52	408
53	455
54	459
55	480
56	486
57	500

n	a(n)
1	3
2	4
3	6
4	15
5	16
6	19
7	20
8	24
9	27
10	30
11	38
12	51
13	54
14	64
15	68
16	73
17	80
18	91
19	95
20	96
21	102
22	111
23	117
24	120
25	135
26	146
27	148
28	152
29	163
30	182
31	190
32	216
33	222
34	228
35	234
36	243
37	252
38	255
39	256
40	270
41	272
42	275
43	303
44	320
45	323
46	326
47	340
48	365
49	375
50	384
51	404
52	408
53	455
54	459
55	480
56	486
57	500