A176146 - cp's OEIS frontend

A176146 a(n) = n-th-semiprime without last digit.

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

[0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 5, 5, 5, 5, 6, 6, 6, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 14, 14, 14, 14, 14, 15, 15, 15, 16, 16, 16, 17, 17, 18, 18, 18, 19, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 22, 22, 23, 23, 24, 24, 25]

cp's OEIS Frontend

A176146 a(n) = n-th-semiprime without last digit.

Table of values

List of values

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

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

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