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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.

A120535 Semiprimes that are not the sum of 3 pentagonal numbers.

Table of values

n a(n)
1 4
2 9
3 21
4 26
5 33
6 38
7 55
8 65
9 77
10 111
11 142
12 159
13 166
14 183
15 205
16 217
17 226
18 265
19 346
20 371
21 395
22 417
23 453
24 551
25 573
26 597
27 655
28 681
29 843
30 905
31 951
32 985
33 1059
34 1165
35 1441
36 1563
37 2033
38 2073
39 2126
40 2361
41 2487
42 2841
43 2991
44 3831
45 4061
46 4601
47 8691
48 10911

List of values

[4, 9, 21, 26, 33, 38, 55, 65, 77, 111, 142, 159, 166, 183, 205, 217, 226, 265, 346, 371, 395, 417, 453, 551, 573, 597, 655, 681, 843, 905, 951, 985, 1059, 1165, 1441, 1563, 2033, 2073, 2126, 2361, 2487, 2841, 2991, 3831, 4061, 4601, 8691, 10911]

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

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