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.

A067274 Number of ordered integer pairs (b,c), with -n<=b<=n, -n<=c<=n, such that both roots of x^2+bx+c=0 are integers.

Table of values

n a(n)
0 1
1 4
2 10
3 16
4 25
5 31
6 41
7 47
8 57
9 66
10 76
11 82
12 96
13 102
14 112
15 122
16 135
17 141
18 155
19 161
20 175
21 185
22 195
23 201
24 219
25 228
26 238
27 248
28 262
29 268
30 286
31 292
32 306
33 316
34 326
35 336
36 357
37 363
38 373
39 383
40 401
41 407
42 425
43 431
44 445
45 459
46 469
47 475
48 497
49 506
50 520
51 530
52 544
53 550
54 568

List of values

[1, 4, 10, 16, 25, 31, 41, 47, 57, 66, 76, 82, 96, 102, 112, 122, 135, 141, 155, 161, 175, 185, 195, 201, 219, 228, 238, 248, 262, 268, 286, 292, 306, 316, 326, 336, 357, 363, 373, 383, 401, 407, 425, 431, 445, 459, 469, 475, 497, 506, 520, 530, 544, 550, 568]

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

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