A256447 - cp's OEIS frontend

A256447 Number of integers in range (prime(n)^2)+1 .. (prime(n)*prime(n+1)) whose smallest prime factor is at least prime(n): a(n) = A250477(n) - A250474(n).

n	a(n)
1	2
2	3
3	3
4	7
5	5
6	9
7	6
8	13
9	23
10	9
11	28
12	22
13	12
14	24
15	39
16	37
17	17
18	44
19	32
20	16
21	53
22	37
23	53
24	76
25	46
26	23
27	43
28	20
29	49
30	161
31	48
32	82
33	23
34	142
35	27
36	91
37	90
38	66
39	103
40	97
41	41
42	181
43	41
44	74
45	39
46	228
47	228
48	86
49	45
50	86
51	130
52	44
53	217
54	134
55	141
56	138
57	46
58	148
59	106
60	47
61	261
62	355
63	116
64	53
65	109
66	387
67	166
68	284
69	65
70	119
71	181
72	243
73	198
74	195
75	122
76	190
77	268
78	125
79	265
80	330
81	78

[2, 3, 3, 7, 5, 9, 6, 13, 23, 9, 28, 22, 12, 24, 39, 37, 17, 44, 32, 16, 53, 37, 53, 76, 46, 23, 43, 20, 49, 161, 48, 82, 23, 142, 27, 91, 90, 66, 103, 97, 41, 181, 41, 74, 39, 228, 228, 86, 45, 86, 130, 44, 217, 134, 141, 138, 46, 148, 106, 47, 261, 355, 116, 53, 109, 387, 166, 284, 65, 119, 181, 243, 198, 195, 122, 190, 268, 125, 265, 330, 78]

cp's OEIS Frontend

A256447 Number of integers in range (prime(n)^2)+1 .. (prime(n)*prime(n+1)) whose smallest prime factor is at least prime(n): a(n) = A250477(n) - A250474(n).

Table of values

List of values

n	a(n)
1	2
2	3
3	3
4	7
5	5
6	9
7	6
8	13
9	23
10	9
11	28
12	22
13	12
14	24
15	39
16	37
17	17
18	44
19	32
20	16
21	53
22	37
23	53
24	76
25	46
26	23
27	43
28	20
29	49
30	161
31	48
32	82
33	23
34	142
35	27
36	91
37	90
38	66
39	103
40	97
41	41
42	181
43	41
44	74
45	39
46	228
47	228
48	86
49	45
50	86
51	130
52	44
53	217
54	134
55	141
56	138
57	46
58	148
59	106
60	47
61	261
62	355
63	116
64	53
65	109
66	387
67	166
68	284
69	65
70	119
71	181
72	243
73	198
74	195
75	122
76	190
77	268
78	125
79	265
80	330
81	78

n	a(n)
1	2
2	3
3	3
4	7
5	5
6	9
7	6
8	13
9	23
10	9
11	28
12	22
13	12
14	24
15	39
16	37
17	17
18	44
19	32
20	16
21	53
22	37
23	53
24	76
25	46
26	23
27	43
28	20
29	49
30	161
31	48
32	82
33	23
34	142
35	27
36	91
37	90
38	66
39	103
40	97
41	41
42	181
43	41
44	74
45	39
46	228
47	228
48	86
49	45
50	86
51	130
52	44
53	217
54	134
55	141
56	138
57	46
58	148
59	106
60	47
61	261
62	355
63	116
64	53
65	109
66	387
67	166
68	284
69	65
70	119
71	181
72	243
73	198
74	195
75	122
76	190
77	268
78	125
79	265
80	330
81	78

n	a(n)
1	2
2	3
3	3
4	7
5	5
6	9
7	6
8	13
9	23
10	9
11	28
12	22
13	12
14	24
15	39
16	37
17	17
18	44
19	32
20	16
21	53
22	37
23	53
24	76
25	46
26	23
27	43
28	20
29	49
30	161
31	48
32	82
33	23
34	142
35	27
36	91
37	90
38	66
39	103
40	97
41	41
42	181
43	41
44	74
45	39
46	228
47	228
48	86
49	45
50	86
51	130
52	44
53	217
54	134
55	141
56	138
57	46
58	148
59	106
60	47
61	261
62	355
63	116
64	53
65	109
66	387
67	166
68	284
69	65
70	119
71	181
72	243
73	198
74	195
75	122
76	190
77	268
78	125
79	265
80	330
81	78