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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.

A190501 Number of Ramanujan primes R_k such that 2^(n-1) < R_k <= 2^n.

Table of values

n a(n)
0 0
1 1
2 0
3 0
4 1
5 2
6 3
7 6
8 10
9 19
10 33
11 62
12 118
13 208
14 409
15 740
16 1418
17 2676
18 5043
19 9638
20 18248
21 34949
22 66752
23 127880
24 245489
25 472113
26 908302
27 1751624
28 3381546
29 6534616
30 12645372
31 24490255
32 47485123
33 92152929
34 178987716
35 347943866
36 676925069
37 1317911597
38 2567659990
39 5005877954
40 9765539069
41 19062301793
42 37230980158
43 72756216207
44 142253989491
45 278275735952
46 544621563320
47 1066382258001

List of values

[0, 1, 0, 0, 1, 2, 3, 6, 10, 19, 33, 62, 118, 208, 409, 740, 1418, 2676, 5043, 9638, 18248, 34949, 66752, 127880, 245489, 472113, 908302, 1751624, 3381546, 6534616, 12645372, 24490255, 47485123, 92152929, 178987716, 347943866, 676925069, 1317911597, 2567659990, 5005877954, 9765539069, 19062301793, 37230980158, 72756216207, 142253989491, 278275735952, 544621563320, 1066382258001]

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

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