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.

A351354 Numbers k such that the k-th centered 40-gonal numbers (A195317) is a square.

Table of values

n a(n)
1 1
2 3
3 7
4 45
5 117
6 799
7 2091
8 14329
9 37513
10 257115
11 673135
12 4613733
13 12078909
14 82790071
15 216747219
16 1485607537
17 3889371025
18 26658145587
19 69791931223
20 478361013021
21 1252365390981
22 8583840088783
23 22472785106427
24 154030760585065
25 403257766524697
26 2763969850442379

List of values

[1, 3, 7, 45, 117, 799, 2091, 14329, 37513, 257115, 673135, 4613733, 12078909, 82790071, 216747219, 1485607537, 3889371025, 26658145587, 69791931223, 478361013021, 1252365390981, 8583840088783, 22472785106427, 154030760585065, 403257766524697, 2763969850442379]

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

Content is available under The OEIS End-User License Agreement.