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.

A137816 Nonsquarefree "year numbers" (numbers n such that phi(n) = 2*phi(sigma(n)): A137815).

Table of values

n a(n)
1 5491
2 8075
3 25317
4 27455
5 71383
6 72283
7 76131
8 104975
9 138575
10 193041
11 203167
12 295569
13 295947
14 298775
15 334951
16 356915
17 361415
18 400843
19 451535
20 492275
21 509575
22 572975
23 589475
24 595975
25 654493
26 683757
27 815975
28 862087
29 876627
30 919075
31 936729

List of values

[5491, 8075, 25317, 27455, 71383, 72283, 76131, 104975, 138575, 193041, 203167, 295569, 295947, 298775, 334951, 356915, 361415, 400843, 451535, 492275, 509575, 572975, 589475, 595975, 654493, 683757, 815975, 862087, 876627, 919075, 936729]