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.

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

Table of values

n a(n)
1 4
2 9
3 16
4 24
5 25
6 40
7 49
8 54
9 56
10 64
11 81
12 88
13 96
14 104
15 121
16 135
17 136
18 144
19 152
20 160
21 169
22 184
23 189
24 224
25 232
26 240
27 248
28 250
29 256
30 289
31 296
32 297
33 324
34 328
35 336
36 344
37 351
38 352
39 361
40 375
41 376
42 384
43 400
44 416
45 424
46 459
47 472
48 486
49 488
50 513
51 528
52 529
53 536
54 544
55 560

List of values

[4, 9, 16, 24, 25, 40, 49, 54, 56, 64, 81, 88, 96, 104, 121, 135, 136, 144, 152, 160, 169, 184, 189, 224, 232, 240, 248, 250, 256, 289, 296, 297, 324, 328, 336, 344, 351, 352, 361, 375, 376, 384, 400, 416, 424, 459, 472, 486, 488, 513, 528, 529, 536, 544, 560]

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

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