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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.

A249065 Numbers n such that n = concatenate(a, b) and sigma(a) + sigma(b) = phi(n).

Table of values

n a(n)
1 12
2 420
3 966
4 2700
5 5700
6 5940
7 7440
8 12540
9 71100
10 76680
11 107880
12 118680
13 121920
14 156420
15 160650
16 161880
17 259080
18 284580
19 339150
20 353430
21 395850
22 498420
23 585200
24 600780
25 701220
26 746130
27 752100
28 771420
29 870870
30 1052220
31 1249680
32 1654620
33 1684020
34 1696080

List of values

[12, 420, 966, 2700, 5700, 5940, 7440, 12540, 71100, 76680, 107880, 118680, 121920, 156420, 160650, 161880, 259080, 284580, 339150, 353430, 395850, 498420, 585200, 600780, 701220, 746130, 752100, 771420, 870870, 1052220, 1249680, 1654620, 1684020, 1696080]

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

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