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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.

A232355 Numbers k such that sigma(triangular(k)) = sigma(k)^2.

Table of values

n a(n)
1 1
2 11
3 695
4 991
5 2839
6 3707
7 9347
8 10703
9 12847
10 27089
11 42251
12 56419
13 74671
14 115289
15 168739
16 191051
17 219295
18 233729
19 280111
20 300731
21 326899
22 353651
23 430859
24 611799
25 642991
26 661715
27 1035827
28 1116607
29 1181579
30 1234519
31 1365491
32 1485035
33 1777099
34 1854671
35 1905875

List of values

[1, 11, 695, 991, 2839, 3707, 9347, 10703, 12847, 27089, 42251, 56419, 74671, 115289, 168739, 191051, 219295, 233729, 280111, 300731, 326899, 353651, 430859, 611799, 642991, 661715, 1035827, 1116607, 1181579, 1234519, 1365491, 1485035, 1777099, 1854671, 1905875]

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

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