cp's OEIS Frontend

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.

A362318 Number of odd semiprimes between 2^(n-1) and 2^n.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 2
5 2
6 7
7 13
8 27
9 52
10 104
11 210
12 398
13 807
14 1542
15 3046
16 5936
17 11565
18 22584
19 44012
20 86062
21 167786
22 327936
23 640630
24 1252327
25 2448518
26 4791344
27 9378159
28 18364095
29 35979682
30 70515477
31 138275503
32 271246674
33 532304906
34 1045047118
35 2052464984
36 4032502528

List of values

[0, 0, 0, 0, 2, 2, 7, 13, 27, 52, 104, 210, 398, 807, 1542, 3046, 5936, 11565, 22584, 44012, 86062, 167786, 327936, 640630, 1252327, 2448518, 4791344, 9378159, 18364095, 35979682, 70515477, 138275503, 271246674, 532304906, 1045047118, 2052464984, 4032502528]

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

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