A228520 - cp's OEIS frontend

A228520 a(n) is the smallest number such that if x >= a(n), then pi^(x) - pi^(x/2) >= n, where pi^*(x) is the number of terms of A050376 <= x.

n	a(n)
1	2
2	3
3	11
4	16
5	23
6	41
7	47
8	59
9	67
10	71
11	79
12	101
13	107
14	109
15	127
16	149
17	167
18	169
19	179
20	181
21	227
22	229
23	233
24	239
25	256
26	263
27	269
28	281
29	283
30	307
31	347
32	349
33	359
34	367
35	373
36	401
37	409
38	419
39	431
40	433
41	439
42	461
43	487
44	491
45	521
46	569
47	587
48	593
49	599
50	601
51	607
52	617
53	641
54	643
55	647

[2, 3, 11, 16, 23, 41, 47, 59, 67, 71, 79, 101, 107, 109, 127, 149, 167, 169, 179, 181, 227, 229, 233, 239, 256, 263, 269, 281, 283, 307, 347, 349, 359, 367, 373, 401, 409, 419, 431, 433, 439, 461, 487, 491, 521, 569, 587, 593, 599, 601, 607, 617, 641, 643, 647]

cp's OEIS Frontend

A228520 a(n) is the smallest number such that if x >= a(n), then pi^(x) - pi^(x/2) >= n, where pi^*(x) is the number of terms of A050376 <= x.

Table of values

List of values

n	a(n)
1	2
2	3
3	11
4	16
5	23
6	41
7	47
8	59
9	67
10	71
11	79
12	101
13	107
14	109
15	127
16	149
17	167
18	169
19	179
20	181
21	227
22	229
23	233
24	239
25	256
26	263
27	269
28	281
29	283
30	307
31	347
32	349
33	359
34	367
35	373
36	401
37	409
38	419
39	431
40	433
41	439
42	461
43	487
44	491
45	521
46	569
47	587
48	593
49	599
50	601
51	607
52	617
53	641
54	643
55	647

n	a(n)
1	2
2	3
3	11
4	16
5	23
6	41
7	47
8	59
9	67
10	71
11	79
12	101
13	107
14	109
15	127
16	149
17	167
18	169
19	179
20	181
21	227
22	229
23	233
24	239
25	256
26	263
27	269
28	281
29	283
30	307
31	347
32	349
33	359
34	367
35	373
36	401
37	409
38	419
39	431
40	433
41	439
42	461
43	487
44	491
45	521
46	569
47	587
48	593
49	599
50	601
51	607
52	617
53	641
54	643
55	647

cp's OEIS Frontend

A228520 a(n) is the smallest number such that if x >= a(n), then pi^*(x) - pi^*(x/2) >= n, where pi^*(x) is the number of terms of A050376 <= x.

Table of values

List of values

A228520 a(n) is the smallest number such that if x >= a(n), then pi^(x) - pi^(x/2) >= n, where pi^*(x) is the number of terms of A050376 <= x.

n	a(n)
1	2
2	3
3	11
4	16
5	23
6	41
7	47
8	59
9	67
10	71
11	79
12	101
13	107
14	109
15	127
16	149
17	167
18	169
19	179
20	181
21	227
22	229
23	233
24	239
25	256
26	263
27	269
28	281
29	283
30	307
31	347
32	349
33	359
34	367
35	373
36	401
37	409
38	419
39	431
40	433
41	439
42	461
43	487
44	491
45	521
46	569
47	587
48	593
49	599
50	601
51	607
52	617
53	641
54	643
55	647