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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.

A378158 Numbers k such that lpf(!k) < lpf(k-1), where lpf(k) = A020639(k) and !k = A000166(k).

Table of values

n a(n)
1 20
2 38
3 42
4 60
5 90
6 104
7 108
8 110
9 114
10 132
11 138
12 152
13 164
14 170
15 174
16 192
17 194
18 198
19 240
20 242
21 258
22 284
23 294
24 324
25 338
26 350
27 360
28 368
29 390
30 398
31 434
32 438
33 450
34 462
35 482
36 488
37 500
38 504
39 510
40 522
41 524
42 528
43 542
44 548
45 564
46 570
47 588
48 600
49 602
50 614
51 618
52 632
53 642
54 644
55 648

List of values

[20, 38, 42, 60, 90, 104, 108, 110, 114, 132, 138, 152, 164, 170, 174, 192, 194, 198, 240, 242, 258, 284, 294, 324, 338, 350, 360, 368, 390, 398, 434, 438, 450, 462, 482, 488, 500, 504, 510, 522, 524, 528, 542, 548, 564, 570, 588, 600, 602, 614, 618, 632, 642, 644, 648]

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

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