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.

A158642 Palindromic numbers which are the product of a number k and its reversal (k written backwards).

Table of values

n a(n)
0 0
1 1
2 4
3 9
4 121
5 252
6 484
7 10201
8 12321
9 14641
10 20502
11 23632
12 26962
13 40804
14 44944
15 1002001
16 1113111
17 1226221
18 1234321
19 1357531
20 2005002
21 2126212
22 2216122
23 2249422
24 2347432
25 2429242
26 4008004
27 4229224
28 100020001
29 102030201
30 104060401
31 110131011
32 112242211
33 114373411
34 120262021

List of values

[0, 1, 4, 9, 121, 252, 484, 10201, 12321, 14641, 20502, 23632, 26962, 40804, 44944, 1002001, 1113111, 1226221, 1234321, 1357531, 2005002, 2126212, 2216122, 2249422, 2347432, 2429242, 4008004, 4229224, 100020001, 102030201, 104060401, 110131011, 112242211, 114373411, 120262021]

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

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