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.

A370584 Number of subsets of {1..n} such that only one set can be obtained by choosing a different prime factor of each element.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 6
5 12
6 18
7 36
8 48
9 68
10 104
11 208
12 284
13 568
14 888
15 1296
16 1548
17 3096
18 3968
19 7936
20 10736
21 15440
22 24008
23 48016
24 58848
25 73680
26 114368
27 132608
28 176240
29 352480
30 449824
31 899648
32 994976
33 1399968
34 2160720
35 2859584
36 3296048
37 6592096
38 10156672
39 14214576
40 16892352

List of values

[1, 1, 2, 4, 6, 12, 18, 36, 48, 68, 104, 208, 284, 568, 888, 1296, 1548, 3096, 3968, 7936, 10736, 15440, 24008, 48016, 58848, 73680, 114368, 132608, 176240, 352480, 449824, 899648, 994976, 1399968, 2160720, 2859584, 3296048, 6592096, 10156672, 14214576, 16892352]

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

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