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.

A320913 Numbers with an even number of prime factors (counted with multiplicity) that cannot be factored into squarefree semiprimes (A320891) but can be factored into distinct semiprimes (A320912).

Table of values

n a(n)
1 4
2 9
3 24
4 25
5 40
6 49
7 54
8 56
9 88
10 104
11 121
12 135
13 136
14 152
15 169
16 184
17 189
18 232
19 240
20 248
21 250
22 289
23 296
24 297
25 328
26 336
27 344
28 351
29 361
30 375
31 376
32 424
33 459
34 472
35 488
36 513
37 528
38 529
39 536
40 560
41 568
42 584
43 621
44 624
45 632
46 664
47 686
48 712
49 776
50 783
51 808
52 810
53 816
54 824

List of values

[4, 9, 24, 25, 40, 49, 54, 56, 88, 104, 121, 135, 136, 152, 169, 184, 189, 232, 240, 248, 250, 289, 296, 297, 328, 336, 344, 351, 361, 375, 376, 424, 459, 472, 488, 513, 528, 529, 536, 560, 568, 584, 621, 624, 632, 664, 686, 712, 776, 783, 808, 810, 816, 824]

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

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