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.

A075875 Triangular numbers that are 3-almost primes.

Table of values

n a(n)
1 28
2 45
3 66
4 78
5 105
6 153
7 171
8 190
9 231
10 325
11 406
12 435
13 465
14 561
15 595
16 741
17 861
18 903
19 946
20 1378
21 1653
22 2211
23 2278
24 2485
25 3081
26 3655
27 3741
28 4371
29 4465
30 4753
31 5151
32 5253
33 5995
34 6441
35 7021
36 7381
37 7503
38 8515
39 8911
40 9453
41 9591
42 10011
43 10153
44 10585
45 11026

List of values

[28, 45, 66, 78, 105, 153, 171, 190, 231, 325, 406, 435, 465, 561, 595, 741, 861, 903, 946, 1378, 1653, 2211, 2278, 2485, 3081, 3655, 3741, 4371, 4465, 4753, 5151, 5253, 5995, 6441, 7021, 7381, 7503, 8515, 8911, 9453, 9591, 10011, 10153, 10585, 11026]

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

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