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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.

A350989 Numbers k such that both k and the k-th triangular number are binary palindromes.

Table of values

n a(n)
1 0
2 1
3 5
4 9
5 17
6 21
7 33
8 65
9 129
10 257
11 341
12 513
13 693
14 1025
15 1365
16 1397
17 2049
18 4097
19 8193
20 16385
21 21845
22 32769
23 43605
24 65537
25 87125
26 87381
27 131073
28 262145
29 524289
30 1048577
31 1398101
32 2097153
33 2796885
34 4194305
35 5592405
36 5594453
37 8388609
38 16777217
39 33554433
40 67108865

List of values

[0, 1, 5, 9, 17, 21, 33, 65, 129, 257, 341, 513, 693, 1025, 1365, 1397, 2049, 4097, 8193, 16385, 21845, 32769, 43605, 65537, 87125, 87381, 131073, 262145, 524289, 1048577, 1398101, 2097153, 2796885, 4194305, 5592405, 5594453, 8388609, 16777217, 33554433, 67108865]

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

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