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.

A257588 If n = abcd... in decimal, a(n) = |a^2 - b^2 + c^2 - d^2 + ...|.

Table of values

n a(n)
0 0
1 1
2 4
3 9
4 16
5 25
6 36
7 49
8 64
9 81
10 1
11 0
12 3
13 8
14 15
15 24
16 35
17 48
18 63
19 80
20 4
21 3
22 0
23 5
24 12
25 21
26 32
27 45
28 60
29 77
30 9
31 8
32 5
33 0
34 7
35 16
36 27
37 40
38 55
39 72
40 16
41 15
42 12
43 7
44 0
45 9
46 20
47 33
48 48
49 65
50 25
51 24
52 21
53 16
54 9
55 0
56 11
57 24
58 39
59 56
60 36
61 35
62 32
63 27
64 20
65 11
66 0
67 13
68 28
69 45
70 49

List of values

[0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 1, 0, 3, 8, 15, 24, 35, 48, 63, 80, 4, 3, 0, 5, 12, 21, 32, 45, 60, 77, 9, 8, 5, 0, 7, 16, 27, 40, 55, 72, 16, 15, 12, 7, 0, 9, 20, 33, 48, 65, 25, 24, 21, 16, 9, 0, 11, 24, 39, 56, 36, 35, 32, 27, 20, 11, 0, 13, 28, 45, 49]

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

Content is available under The OEIS End-User License Agreement.