A002904 - cp's OEIS frontend

A002904 Delete all letters except c, d, i, l, m, v, x from the US English name of n, then read as Roman numeral if possible, otherwise 0.

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

[0, 0, 0, 0, 4, 9, 5, 1, 1, 0, 55, 55, 1, 0, 1, 9, 5, 1, 1, 0, 0, 0, 0, 0, 4, 9, 5, 1, 1, 1, 1, 1, 1, 1, 0, 0, 4, 2, 2, 0, 0, 0, 0, 0, 4, 9, 5, 1, 1, 1, 1, 1, 1, 1, 0, 0, 4, 2, 2, 9, 9, 9, 9, 9, 0, 0, 0, 0, 0, 5, 5, 5, 5, 5, 0, 0, 0, 6, 6, 1, 1, 1, 1, 1, 0, 0, 4, 2, 2, 1, 1, 1, 1, 1, 0, 0, 4, 2, 2, 0]

cp's OEIS Frontend

A002904 Delete all letters except c, d, i, l, m, v, x from the US English name of n, then read as Roman numeral if possible, otherwise 0.

Table of values

List of values

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

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

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