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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A104272 Ramanujan primes R_n: 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 primes <= x.

Table of values

n a(n)
1 2
2 11
3 17
4 29
5 41
6 47
7 59
8 67
9 71
10 97
11 101
12 107
13 127
14 149
15 151
16 167
17 179
18 181
19 227
20 229
21 233
22 239
23 241
24 263
25 269
26 281
27 307
28 311
29 347
30 349
31 367
32 373
33 401
34 409
35 419
36 431
37 433
38 439
39 461
40 487
41 491
42 503
43 569
44 571
45 587
46 593
47 599
48 601
49 607
50 641
51 643
52 647
53 653
54 659

List of values

[2, 11, 17, 29, 41, 47, 59, 67, 71, 97, 101, 107, 127, 149, 151, 167, 179, 181, 227, 229, 233, 239, 241, 263, 269, 281, 307, 311, 347, 349, 367, 373, 401, 409, 419, 431, 433, 439, 461, 487, 491, 503, 569, 571, 587, 593, 599, 601, 607, 641, 643, 647, 653, 659]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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