A102715 - cp's OEIS frontend

A102715 Triangle read by rows: T(n,k) is phi(binomial(n,k)), where phi is Euler's totient function (0 <= k <= n).

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	2
9	1
10	1
11	2
12	2
13	2
14	1
15	1
16	4
17	4
18	4
19	4
20	1
21	1
22	2
23	8
24	8
25	8
26	2
27	1
28	1
29	6
30	12
31	24
32	24
33	12
34	6
35	1
36	1
37	4
38	12
39	24
40	24
41	24
42	12
43	4
44	1
45	1
46	6
47	12
48	24
49	36
50	36
51	24
52	12
53	6
54	1
55	1
56	4
57	24
58	32
59	48
60	72
61	48
62	32
63	24
64	4
65	1
66	1
67	10
68	40
69	80
70	80
71	120
72	120
73	80
74	80
75	40
76	10
77	1
78	1
79	4
80	20
81	80
82	240
83	240

[1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 2, 2, 2, 1, 1, 4, 4, 4, 4, 1, 1, 2, 8, 8, 8, 2, 1, 1, 6, 12, 24, 24, 12, 6, 1, 1, 4, 12, 24, 24, 24, 12, 4, 1, 1, 6, 12, 24, 36, 36, 24, 12, 6, 1, 1, 4, 24, 32, 48, 72, 48, 32, 24, 4, 1, 1, 10, 40, 80, 80, 120, 120, 80, 80, 40, 10, 1, 1, 4, 20, 80, 240, 240]

cp's OEIS Frontend

A102715 Triangle read by rows: T(n,k) is phi(binomial(n,k)), where phi is Euler's totient function (0 <= k <= n).

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	2
9	1
10	1
11	2
12	2
13	2
14	1
15	1
16	4
17	4
18	4
19	4
20	1
21	1
22	2
23	8
24	8
25	8
26	2
27	1
28	1
29	6
30	12
31	24
32	24
33	12
34	6
35	1
36	1
37	4
38	12
39	24
40	24
41	24
42	12
43	4
44	1
45	1
46	6
47	12
48	24
49	36
50	36
51	24
52	12
53	6
54	1
55	1
56	4
57	24
58	32
59	48
60	72
61	48
62	32
63	24
64	4
65	1
66	1
67	10
68	40
69	80
70	80
71	120
72	120
73	80
74	80
75	40
76	10
77	1
78	1
79	4
80	20
81	80
82	240
83	240

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	2
9	1
10	1
11	2
12	2
13	2
14	1
15	1
16	4
17	4
18	4
19	4
20	1
21	1
22	2
23	8
24	8
25	8
26	2
27	1
28	1
29	6
30	12
31	24
32	24
33	12
34	6
35	1
36	1
37	4
38	12
39	24
40	24
41	24
42	12
43	4
44	1
45	1
46	6
47	12
48	24
49	36
50	36
51	24
52	12
53	6
54	1
55	1
56	4
57	24
58	32
59	48
60	72
61	48
62	32
63	24
64	4
65	1
66	1
67	10
68	40
69	80
70	80
71	120
72	120
73	80
74	80
75	40
76	10
77	1
78	1
79	4
80	20
81	80
82	240
83	240

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	2
9	1
10	1
11	2
12	2
13	2
14	1
15	1
16	4
17	4
18	4
19	4
20	1
21	1
22	2
23	8
24	8
25	8
26	2
27	1
28	1
29	6
30	12
31	24
32	24
33	12
34	6
35	1
36	1
37	4
38	12
39	24
40	24
41	24
42	12
43	4
44	1
45	1
46	6
47	12
48	24
49	36
50	36
51	24
52	12
53	6
54	1
55	1
56	4
57	24
58	32
59	48
60	72
61	48
62	32
63	24
64	4
65	1
66	1
67	10
68	40
69	80
70	80
71	120
72	120
73	80
74	80
75	40
76	10
77	1
78	1
79	4
80	20
81	80
82	240
83	240