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.

A242343 Triangular numbers T such that (T+2) is semiprime.

Table of values

n a(n)
1 36
2 55
3 91
4 120
5 153
6 276
7 300
8 325
9 435
10 595
11 903
12 1035
13 1225
14 1653
15 1711
16 1891
17 2016
18 2145
19 2485
20 2556
21 3003
22 3240
23 3741
24 4095
25 4465
26 4560
27 4851
28 5253
29 5460
30 5565
31 5995
32 6105
33 6216
34 6441
35 6555
36 6903
37 7021
38 7140
39 7260
40 8001
41 8256
42 8911
43 9045
44 9180
45 9591
46 10585

List of values

[36, 55, 91, 120, 153, 276, 300, 325, 435, 595, 903, 1035, 1225, 1653, 1711, 1891, 2016, 2145, 2485, 2556, 3003, 3240, 3741, 4095, 4465, 4560, 4851, 5253, 5460, 5565, 5995, 6105, 6216, 6441, 6555, 6903, 7021, 7140, 7260, 8001, 8256, 8911, 9045, 9180, 9591, 10585]

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

Content is available under The OEIS End-User License Agreement.