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.

A228439 Numbers k dividing u(k), where the Lucas sequence is defined u(i) = u(i-1) - 2*u(i-2) with initial conditions u(0)=0, u(1)=1.

Table of values

n a(n)
1 1
2 7
3 49
4 343
5 2401
6 4753
7 16807
8 33271
9 76783
10 117649
11 232897
12 461041
13 537481
14 823543
15 1630279
16 3227287
17 3762367
18 5764801
19 7447951
20 11411953
21 11527201
22 19358969
23 22591009
24 26336569
25 40353607
26 44720977
27 52135657
28 79883671
29 80690407

List of values

[1, 7, 49, 343, 2401, 4753, 16807, 33271, 76783, 117649, 232897, 461041, 537481, 823543, 1630279, 3227287, 3762367, 5764801, 7447951, 11411953, 11527201, 19358969, 22591009, 26336569, 40353607, 44720977, 52135657, 79883671, 80690407]