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.

A214156 Dual to A214094: a(0)=0, a(1)=1; a(n) = a(n-1) + a(n-2) if a(n-1) + a(n-2) is not semiprime; a(n) is minimal prime divisor of a(n-1) + a(n-2) if a(n-1) + a(n-2) is semiprime.

Table of values

n a(n)
0 0
1 1
2 1
3 2
4 3
5 5
6 8
7 13
8 3
9 16
10 19
11 5
12 24
13 29
14 53
15 2
16 5
17 7
18 12
19 19
20 31
21 50
22 81
23 131
24 212
25 343
26 555
27 2
28 557
29 13
30 570
31 11
32 7
33 18
34 5
35 23
36 28
37 3
38 31
39 2
40 3
41 5
42 8
43 13
44 3
45 16
46 19
47 5
48 24
49 29
50 53
51 2
52 5
53 7
54 12
55 19
56 31
57 50
58 81
59 131
60 212
61 343
62 555
63 2
64 557
65 13
66 570
67 11
68 7
69 18

List of values

[0, 1, 1, 2, 3, 5, 8, 13, 3, 16, 19, 5, 24, 29, 53, 2, 5, 7, 12, 19, 31, 50, 81, 131, 212, 343, 555, 2, 557, 13, 570, 11, 7, 18, 5, 23, 28, 3, 31, 2, 3, 5, 8, 13, 3, 16, 19, 5, 24, 29, 53, 2, 5, 7, 12, 19, 31, 50, 81, 131, 212, 343, 555, 2, 557, 13, 570, 11, 7, 18]

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

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