A054522 - cp's OEIS frontend

A054522 Triangle T(n,k): T(n,k) = phi(k) if k divides n, T(n,k)=0 otherwise (n >= 1, 1<=k<=n). T(n,k) = number of elements of order k in cyclic group of order n.

n	a(n)
1	1
2	1
3	1
4	1
5	0
6	2
7	1
8	1
9	0
10	2
11	1
12	0
13	0
14	0
15	4
16	1
17	1
18	2
19	0
20	0
21	2
22	1
23	0
24	0
25	0
26	0
27	0
28	6
29	1
30	1
31	0
32	2
33	0
34	0
35	0
36	4
37	1
38	0
39	2
40	0
41	0
42	0
43	0
44	0
45	6
46	1
47	1
48	0
49	0
50	4
51	0
52	0
53	0
54	0
55	4
56	1
57	0
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	10
67	1
68	1
69	2
70	2
71	0
72	2
73	0
74	0
75	0
76	0
77	0
78	4
79	1
80	0
81	0
82	0
83	0
84	0
85	0
86	0
87	0
88	0
89	0
90	0
91	12
92	1
93	1
94	0
95	0
96	0
97	0
98	6
99	0
100	0
101	0
102	0
103	0

[1, 1, 1, 1, 0, 2, 1, 1, 0, 2, 1, 0, 0, 0, 4, 1, 1, 2, 0, 0, 2, 1, 0, 0, 0, 0, 0, 6, 1, 1, 0, 2, 0, 0, 0, 4, 1, 0, 2, 0, 0, 0, 0, 0, 6, 1, 1, 0, 0, 4, 0, 0, 0, 0, 4, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 1, 1, 2, 2, 0, 2, 0, 0, 0, 0, 0, 4, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 1, 1, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0]

cp's OEIS Frontend

A054522 Triangle T(n,k): T(n,k) = phi(k) if k divides n, T(n,k)=0 otherwise (n >= 1, 1<=k<=n). T(n,k) = number of elements of order k in cyclic group of order n.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	0
6	2
7	1
8	1
9	0
10	2
11	1
12	0
13	0
14	0
15	4
16	1
17	1
18	2
19	0
20	0
21	2
22	1
23	0
24	0
25	0
26	0
27	0
28	6
29	1
30	1
31	0
32	2
33	0
34	0
35	0
36	4
37	1
38	0
39	2
40	0
41	0
42	0
43	0
44	0
45	6
46	1
47	1
48	0
49	0
50	4
51	0
52	0
53	0
54	0
55	4
56	1
57	0
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	10
67	1
68	1
69	2
70	2
71	0
72	2
73	0
74	0
75	0
76	0
77	0
78	4
79	1
80	0
81	0
82	0
83	0
84	0
85	0
86	0
87	0
88	0
89	0
90	0
91	12
92	1
93	1
94	0
95	0
96	0
97	0
98	6
99	0
100	0
101	0
102	0
103	0

n	a(n)
1	1
2	1
3	1
4	1
5	0
6	2
7	1
8	1
9	0
10	2
11	1
12	0
13	0
14	0
15	4
16	1
17	1
18	2
19	0
20	0
21	2
22	1
23	0
24	0
25	0
26	0
27	0
28	6
29	1
30	1
31	0
32	2
33	0
34	0
35	0
36	4
37	1
38	0
39	2
40	0
41	0
42	0
43	0
44	0
45	6
46	1
47	1
48	0
49	0
50	4
51	0
52	0
53	0
54	0
55	4
56	1
57	0
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	10
67	1
68	1
69	2
70	2
71	0
72	2
73	0
74	0
75	0
76	0
77	0
78	4
79	1
80	0
81	0
82	0
83	0
84	0
85	0
86	0
87	0
88	0
89	0
90	0
91	12
92	1
93	1
94	0
95	0
96	0
97	0
98	6
99	0
100	0
101	0
102	0
103	0

n	a(n)
1	1
2	1
3	1
4	1
5	0
6	2
7	1
8	1
9	0
10	2
11	1
12	0
13	0
14	0
15	4
16	1
17	1
18	2
19	0
20	0
21	2
22	1
23	0
24	0
25	0
26	0
27	0
28	6
29	1
30	1
31	0
32	2
33	0
34	0
35	0
36	4
37	1
38	0
39	2
40	0
41	0
42	0
43	0
44	0
45	6
46	1
47	1
48	0
49	0
50	4
51	0
52	0
53	0
54	0
55	4
56	1
57	0
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	10
67	1
68	1
69	2
70	2
71	0
72	2
73	0
74	0
75	0
76	0
77	0
78	4
79	1
80	0
81	0
82	0
83	0
84	0
85	0
86	0
87	0
88	0
89	0
90	0
91	12
92	1
93	1
94	0
95	0
96	0
97	0
98	6
99	0
100	0
101	0
102	0
103	0