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.

A178547 Composite numbers; start sequence with composite number and end with prime, length of successive sequences are strictly increasing.

Table of values

n a(n)
1 4
2 6
3 12
4 20
5 30
6 42
7 60
8 80
9 102
10 128
11 158
12 192
13 228
14 270
15 314
16 360
17 410
18 462
19 522
20 588
21 660
22 734
23 810
24 888
25 968
26 1050
27 1152
28 1260
29 1374
30 1490
31 1608
32 1734
33 1862
34 1994
35 2130
36 2268
37 2412
38 2558
39 2708
40 2862
41 3020
42 3182
43 3348
44 3518
45 3692
46 3878
47 4074
48 4272
49 4482

List of values

[4, 6, 12, 20, 30, 42, 60, 80, 102, 128, 158, 192, 228, 270, 314, 360, 410, 462, 522, 588, 660, 734, 810, 888, 968, 1050, 1152, 1260, 1374, 1490, 1608, 1734, 1862, 1994, 2130, 2268, 2412, 2558, 2708, 2862, 3020, 3182, 3348, 3518, 3692, 3878, 4074, 4272, 4482]

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

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