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.

A233561 Products p*q of distinct primes such that (p*q - 1)/2 is prime.

Table of values

n a(n)
1 15
2 35
3 39
4 87
5 95
6 119
7 123
8 143
9 159
10 203
11 215
12 219
13 299
14 303
15 327
16 335
17 395
18 447
19 515
20 527
21 543
22 623
23 635
24 695
25 699
26 707
27 767
28 779
29 803
30 843
31 879
32 899
33 923
34 959
35 1007
36 1043
37 1047
38 1115
39 1139
40 1199
41 1203
42 1227
43 1263
44 1347
45 1355
46 1383
47 1403
48 1623
49 1643

List of values

[15, 35, 39, 87, 95, 119, 123, 143, 159, 203, 215, 219, 299, 303, 327, 335, 395, 447, 515, 527, 543, 623, 635, 695, 699, 707, 767, 779, 803, 843, 879, 899, 923, 959, 1007, 1043, 1047, 1115, 1139, 1199, 1203, 1227, 1263, 1347, 1355, 1383, 1403, 1623, 1643]

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

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