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.

A287473 Triangular numbers k such that phi(k) is a square number, where phi(k) is the Euler totient function (A000010).

Table of values

n a(n)
1 1
2 10
3 136
4 630
5 2016
6 7875
7 9180
8 18915
9 32896
10 37128
11 46056
12 58311
13 66430
14 103740
15 131841
16 198135
17 225456
18 301476
19 323610
20 332520
21 408156
22 499500
23 738720
24 786885
25 839160
26 862641
27 922761
28 924120
29 1065070
30 1079715
31 1183491
32 1385280
33 1851850
34 1906128
35 1925703

List of values

[1, 10, 136, 630, 2016, 7875, 9180, 18915, 32896, 37128, 46056, 58311, 66430, 103740, 131841, 198135, 225456, 301476, 323610, 332520, 408156, 499500, 738720, 786885, 839160, 862641, 922761, 924120, 1065070, 1079715, 1183491, 1385280, 1851850, 1906128, 1925703]