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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.

A281898 Numbers k such that k - floor(sqrt(k))^2 and 2k - floor(sqrt(2k))^2 are both squares.

Table of values

n a(n)
1 0
2 1
3 2
4 4
5 5
6 8
7 10
8 13
9 17
10 20
11 25
12 29
13 34
14 40
15 45
16 50
17 58
18 65
19 80
20 85
21 97
22 100
23 125
24 130
25 145
26 170
27 185
28 200
29 221
30 225
31 250
32 260
33 265
34 290
35 325
36 340
37 365
38 377
39 400
40 425
41 445
42 450
43 485
44 493
45 520
46 530
47 545
48 580
49 625
50 650
51 680
52 685
53 730
54 754
55 765
56 785
57 800
58 841
59 845
60 890
61 900

List of values

[0, 1, 2, 4, 5, 8, 10, 13, 17, 20, 25, 29, 34, 40, 45, 50, 58, 65, 80, 85, 97, 100, 125, 130, 145, 170, 185, 200, 221, 225, 250, 260, 265, 290, 325, 340, 365, 377, 400, 425, 445, 450, 485, 493, 520, 530, 545, 580, 625, 650, 680, 685, 730, 754, 765, 785, 800, 841, 845, 890, 900]

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

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