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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.

A350455 T(n,k) is the k-th semiprime whose sum of prime factors equals 2n, triangle T(n,k), n>=2, 1<=k<=A045917(n), read by rows.

Table of values

n a(n)
2 4
3 9
4 15
5 21
6 25
7 35
8 33
9 49
10 39
11 55
12 65
13 77
14 51
15 91
16 57
17 85
18 121
19 95
20 119
21 143
22 69
23 133
24 169
25 115
26 187
27 161
28 209
29 221
30 87
31 247
32 93
33 145
34 253
35 289
36 155
37 203
38 299
39 323
40 217
41 361
42 111
43 319
44 391
45 185
46 341
47 377
48 437
49 123
50 259
51 403
52 129
53 205
54 493
55 529
56 215
57 287
58 407

List of values

[4, 9, 15, 21, 25, 35, 33, 49, 39, 55, 65, 77, 51, 91, 57, 85, 121, 95, 119, 143, 69, 133, 169, 115, 187, 161, 209, 221, 87, 247, 93, 145, 253, 289, 155, 203, 299, 323, 217, 361, 111, 319, 391, 185, 341, 377, 437, 123, 259, 403, 129, 205, 493, 529, 215, 287, 407]

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

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