A278567 - cp's OEIS frontend

A278567 Maximal coefficient (in absolute value) of cyclotomic polynomial C(N,x), where N = n-th number which is a product of exactly three distinct primes = A007304(n).

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	1
9	1
10	1
11	1
12	1
13	2
14	1
15	1
16	1
17	1
18	1
19	2
20	1
21	1
22	1
23	1
24	1
25	2
26	1
27	1
28	2
29	1
30	2
31	1
32	1
33	1
34	1
35	1
36	2
37	1
38	2
39	1
40	1
41	1
42	3
43	1
44	1
45	1
46	1
47	1
48	1
49	2
50	1
51	1
52	1
53	1
54	1
55	2
56	1
57	1
58	1
59	1
60	1
61	1
62	1
63	1
64	1
65	1
66	2
67	2
68	1
69	1
70	1
71	3
72	1
73	1
74	1
75	2
76	1
77	2
78	1
79	2
80	1
81	1
82	2
83	1
84	1
85	1
86	1
87	1
88	3
89	1
90	1
91	1
92	2
93	1
94	2
95	1
96	1
97	1
98	1
99	2
100	1
101	2
102	1
103	1
104	1
105	2

[1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 3, 1, 1, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 1, 1, 1, 1, 3, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 2]

cp's OEIS Frontend

A278567 Maximal coefficient (in absolute value) of cyclotomic polynomial C(N,x), where N = n-th number which is a product of exactly three distinct primes = A007304(n).

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	1
9	1
10	1
11	1
12	1
13	2
14	1
15	1
16	1
17	1
18	1
19	2
20	1
21	1
22	1
23	1
24	1
25	2
26	1
27	1
28	2
29	1
30	2
31	1
32	1
33	1
34	1
35	1
36	2
37	1
38	2
39	1
40	1
41	1
42	3
43	1
44	1
45	1
46	1
47	1
48	1
49	2
50	1
51	1
52	1
53	1
54	1
55	2
56	1
57	1
58	1
59	1
60	1
61	1
62	1
63	1
64	1
65	1
66	2
67	2
68	1
69	1
70	1
71	3
72	1
73	1
74	1
75	2
76	1
77	2
78	1
79	2
80	1
81	1
82	2
83	1
84	1
85	1
86	1
87	1
88	3
89	1
90	1
91	1
92	2
93	1
94	2
95	1
96	1
97	1
98	1
99	2
100	1
101	2
102	1
103	1
104	1
105	2

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	1
9	1
10	1
11	1
12	1
13	2
14	1
15	1
16	1
17	1
18	1
19	2
20	1
21	1
22	1
23	1
24	1
25	2
26	1
27	1
28	2
29	1
30	2
31	1
32	1
33	1
34	1
35	1
36	2
37	1
38	2
39	1
40	1
41	1
42	3
43	1
44	1
45	1
46	1
47	1
48	1
49	2
50	1
51	1
52	1
53	1
54	1
55	2
56	1
57	1
58	1
59	1
60	1
61	1
62	1
63	1
64	1
65	1
66	2
67	2
68	1
69	1
70	1
71	3
72	1
73	1
74	1
75	2
76	1
77	2
78	1
79	2
80	1
81	1
82	2
83	1
84	1
85	1
86	1
87	1
88	3
89	1
90	1
91	1
92	2
93	1
94	2
95	1
96	1
97	1
98	1
99	2
100	1
101	2
102	1
103	1
104	1
105	2

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	1
9	1
10	1
11	1
12	1
13	2
14	1
15	1
16	1
17	1
18	1
19	2
20	1
21	1
22	1
23	1
24	1
25	2
26	1
27	1
28	2
29	1
30	2
31	1
32	1
33	1
34	1
35	1
36	2
37	1
38	2
39	1
40	1
41	1
42	3
43	1
44	1
45	1
46	1
47	1
48	1
49	2
50	1
51	1
52	1
53	1
54	1
55	2
56	1
57	1
58	1
59	1
60	1
61	1
62	1
63	1
64	1
65	1
66	2
67	2
68	1
69	1
70	1
71	3
72	1
73	1
74	1
75	2
76	1
77	2
78	1
79	2
80	1
81	1
82	2
83	1
84	1
85	1
86	1
87	1
88	3
89	1
90	1
91	1
92	2
93	1
94	2
95	1
96	1
97	1
98	1
99	2
100	1
101	2
102	1
103	1
104	1
105	2