A333995 - cp's OEIS frontend

A333995 a(n) = number of distinct composite numbers in the n X n multiplication table that are not in the n-1 X n-1 multiplication table.

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	4
7	6
8	5
9	6
10	6
11	10
12	6
13	12
14	8
15	9
16	8
17	16
18	9
19	18
20	10
21	12
22	12
23	22
24	10
25	16
26	14
27	15
28	13
29	28
30	12
31	30
32	15
33	18
34	18
35	20
36	13
37	36
38	20
39	21
40	16
41	40
42	17
43	42
44	20
45	21
46	24
47	46
48	17
49	31
50	22
51	27
52	23
53	52

[0, 1, 2, 3, 4, 4, 6, 5, 6, 6, 10, 6, 12, 8, 9, 8, 16, 9, 18, 10, 12, 12, 22, 10, 16, 14, 15, 13, 28, 12, 30, 15, 18, 18, 20, 13, 36, 20, 21, 16, 40, 17, 42, 20, 21, 24, 46, 17, 31, 22, 27, 23, 52]

cp's OEIS Frontend

A333995 a(n) = number of distinct composite numbers in the n X n multiplication table that are not in the n-1 X n-1 multiplication table.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	4
7	6
8	5
9	6
10	6
11	10
12	6
13	12
14	8
15	9
16	8
17	16
18	9
19	18
20	10
21	12
22	12
23	22
24	10
25	16
26	14
27	15
28	13
29	28
30	12
31	30
32	15
33	18
34	18
35	20
36	13
37	36
38	20
39	21
40	16
41	40
42	17
43	42
44	20
45	21
46	24
47	46
48	17
49	31
50	22
51	27
52	23
53	52

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	4
7	6
8	5
9	6
10	6
11	10
12	6
13	12
14	8
15	9
16	8
17	16
18	9
19	18
20	10
21	12
22	12
23	22
24	10
25	16
26	14
27	15
28	13
29	28
30	12
31	30
32	15
33	18
34	18
35	20
36	13
37	36
38	20
39	21
40	16
41	40
42	17
43	42
44	20
45	21
46	24
47	46
48	17
49	31
50	22
51	27
52	23
53	52

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	4
7	6
8	5
9	6
10	6
11	10
12	6
13	12
14	8
15	9
16	8
17	16
18	9
19	18
20	10
21	12
22	12
23	22
24	10
25	16
26	14
27	15
28	13
29	28
30	12
31	30
32	15
33	18
34	18
35	20
36	13
37	36
38	20
39	21
40	16
41	40
42	17
43	42
44	20
45	21
46	24
47	46
48	17
49	31
50	22
51	27
52	23
53	52