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.

A203077 Alternating-parity rearrangement of natural numbers: a(n) is the smallest number such that a(n-1)^2 + a(n)^2 is odd and composite.

Table of values

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

List of values

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

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

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