A081306 - cp's OEIS frontend

A081306 Numbers n with prime factors less than 2*spf(n), where spf(m) is the smallest prime factor of m (A020639).

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	12
12	13
13	15
14	16
15	17
16	18
17	19
18	23
19	24
20	25
21	27
22	29
23	31
24	32
25	35
26	36
27	37
28	41
29	43
30	45
31	47
32	48
33	49
34	53
35	54
36	59
37	61
38	64
39	67
40	71
41	72
42	73
43	75
44	77
45	79
46	81
47	83
48	89
49	91
50	96
51	97
52	101
53	103
54	107
55	108
56	109
57	113
58	121
59	125
60	127
61	128
62	131
63	135
64	137
65	139
66	143
67	144

[1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 15, 16, 17, 18, 19, 23, 24, 25, 27, 29, 31, 32, 35, 36, 37, 41, 43, 45, 47, 48, 49, 53, 54, 59, 61, 64, 67, 71, 72, 73, 75, 77, 79, 81, 83, 89, 91, 96, 97, 101, 103, 107, 108, 109, 113, 121, 125, 127, 128, 131, 135, 137, 139, 143, 144]

cp's OEIS Frontend

A081306 Numbers n with prime factors less than 2*spf(n), where spf(m) is the smallest prime factor of m (A020639).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	12
12	13
13	15
14	16
15	17
16	18
17	19
18	23
19	24
20	25
21	27
22	29
23	31
24	32
25	35
26	36
27	37
28	41
29	43
30	45
31	47
32	48
33	49
34	53
35	54
36	59
37	61
38	64
39	67
40	71
41	72
42	73
43	75
44	77
45	79
46	81
47	83
48	89
49	91
50	96
51	97
52	101
53	103
54	107
55	108
56	109
57	113
58	121
59	125
60	127
61	128
62	131
63	135
64	137
65	139
66	143
67	144

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	12
12	13
13	15
14	16
15	17
16	18
17	19
18	23
19	24
20	25
21	27
22	29
23	31
24	32
25	35
26	36
27	37
28	41
29	43
30	45
31	47
32	48
33	49
34	53
35	54
36	59
37	61
38	64
39	67
40	71
41	72
42	73
43	75
44	77
45	79
46	81
47	83
48	89
49	91
50	96
51	97
52	101
53	103
54	107
55	108
56	109
57	113
58	121
59	125
60	127
61	128
62	131
63	135
64	137
65	139
66	143
67	144

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	12
12	13
13	15
14	16
15	17
16	18
17	19
18	23
19	24
20	25
21	27
22	29
23	31
24	32
25	35
26	36
27	37
28	41
29	43
30	45
31	47
32	48
33	49
34	53
35	54
36	59
37	61
38	64
39	67
40	71
41	72
42	73
43	75
44	77
45	79
46	81
47	83
48	89
49	91
50	96
51	97
52	101
53	103
54	107
55	108
56	109
57	113
58	121
59	125
60	127
61	128
62	131
63	135
64	137
65	139
66	143
67	144