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.

A056777 Composite numbers k such that both phi(k+12) = phi(k) + 12 and sigma(k+12) = sigma(k) + 12.

Table of values

n a(n)
1 65
2 209
3 11009
4 38009
5 680609
6 2205209
7 3515609
8 4347209
9 10595009
10 12006209
11 31979009
12 89019209
13 169130009
14 244766009
15 247590209
16 258084209
17 325622009
18 357777209
19 377330609
20 441630209
21 496175609
22 640343009
23 1006475609

List of values

[65, 209, 11009, 38009, 680609, 2205209, 3515609, 4347209, 10595009, 12006209, 31979009, 89019209, 169130009, 244766009, 247590209, 258084209, 325622009, 357777209, 377330609, 441630209, 496175609, 640343009, 1006475609]

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

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