A094457 - cp's OEIS frontend

A094457 a(n) is the largest number k < n in a neighborhood of n defined by prime factorization, specifically, A127185(n,k) <= 2.

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

[1, 2, 2, 3, 4, 5, 4, 6, 6, 7, 8, 11, 10, 10, 8, 13, 12, 17, 12, 15, 14, 19, 16, 15, 22, 18, 20, 23, 20, 29, 16, 22, 26, 25, 24, 31, 34, 33, 24, 37, 30, 41, 28, 30, 38, 43, 32, 35, 30, 39, 44, 47, 36, 35, 40, 51, 46, 53, 40, 59, 58, 45, 32, 55, 44, 61, 52, 57, 50, 67, 48, 71, 62]

cp's OEIS Frontend

A094457 a(n) is the largest number k < n in a neighborhood of n defined by prime factorization, specifically, A127185(n,k) <= 2.

Table of values

List of values

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

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

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