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.

A178509 Smallest value of k for which 6*k+1 divides the subset of centered hexagonal terms included in A177019 that admit only factors like 6*k+1.

Table of values

n a(n)
0 1
1 55
2 26
3 5
4 50005000
5 1
6 1
7 16
8 1936
9 500000000500000000
10 15333927
11 1
12 1
13 18316
14 3
15 7
16 1526
17 1
18 1
19 12
20 73
21 38
22 47
23 1
24 1
25 121
26 43502
27 12
28 11
29 1
30 1
31 18
32 3
33 5
34 10
35 1
36 1
37 481
38 2043419605725853
39 921
40 3835
41 1
42 1
43 12
44 10
45 13
46 25
47 1
48 1
49 18
50 3
51 12
52 62
53 1
54 1
55 76
56 398
57 7

List of values

[1, 55, 26, 5, 50005000, 1, 1, 16, 1936, 500000000500000000, 15333927, 1, 1, 18316, 3, 7, 1526, 1, 1, 12, 73, 38, 47, 1, 1, 121, 43502, 12, 11, 1, 1, 18, 3, 5, 10, 1, 1, 481, 2043419605725853, 921, 3835, 1, 1, 12, 10, 13, 25, 1, 1, 18, 3, 12, 62, 1, 1, 76, 398, 7]