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.

A260428 Composite numbers whose binary representations encode a polynomial (with coefficients 0 or 1) which is irreducible over Q, but reducible over GF(2).

Table of values

n a(n)
1 69
2 77
3 81
4 121
5 169
6 205
7 209
8 261
9 265
10 275
11 289
12 295
13 305
14 321
15 323
16 327
17 329
18 339
19 377
20 405
21 407
22 437
23 453
24 473
25 475
26 481
27 493
28 517
29 533
30 551
31 553
32 559
33 565
34 575
35 581
36 583
37 595
38 625
39 649
40 667
41 671
42 689
43 703
44 707
45 737
46 747
47 749
48 755
49 763
50 767
51 779
52 781
53 785
54 805
55 815
56 833
57 835
58 851
59 855
60 861
61 869
62 893
63 905

List of values

[69, 77, 81, 121, 169, 205, 209, 261, 265, 275, 289, 295, 305, 321, 323, 327, 329, 339, 377, 405, 407, 437, 453, 473, 475, 481, 493, 517, 533, 551, 553, 559, 565, 575, 581, 583, 595, 625, 649, 667, 671, 689, 703, 707, 737, 747, 749, 755, 763, 767, 779, 781, 785, 805, 815, 833, 835, 851, 855, 861, 869, 893, 905]

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

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