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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.

A048692 Triangle read by rows in which row n contains first n numbers with exactly n distinct prime factors.

Table of values

n a(n)
1 2
2 6
3 10
4 30
5 42
6 60
7 210
8 330
9 390
10 420
11 2310
12 2730
13 3570
14 3990
15 4290
16 30030
17 39270
18 43890
19 46410
20 51870
21 53130
22 510510
23 570570
24 690690
25 746130
26 870870
27 881790
28 903210
29 9699690
30 11741730
31 13123110
32 14804790
33 15825810
34 16546530
35 17160990
36 17687670
37 223092870
38 281291010
39 300690390
40 340510170
41 358888530
42 363993630
43 380570190
44 397687290
45 406816410

List of values

[2, 6, 10, 30, 42, 60, 210, 330, 390, 420, 2310, 2730, 3570, 3990, 4290, 30030, 39270, 43890, 46410, 51870, 53130, 510510, 570570, 690690, 746130, 870870, 881790, 903210, 9699690, 11741730, 13123110, 14804790, 15825810, 16546530, 17160990, 17687670, 223092870, 281291010, 300690390, 340510170, 358888530, 363993630, 380570190, 397687290, 406816410]

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

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