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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.

A065550 a(n) = floor(sqrt(phi(w)*sigma(w)+w^2)), where w=10^n.

Table of values

n a(n)
1 13
2 136
3 1391
4 14030
5 140865
6 1411444
7 14128309
8 141352267
9 1413868217
10 14140409111
11 141412724154
12 1414170403052
13 14141919829640
14 141420277272713
15 1414208167563878
16 14142108649717545
17 141421221367320690
18 1414212888023339560
19 14142132251982630599
20 141421339378569021517

List of values

[13, 136, 1391, 14030, 140865, 1411444, 14128309, 141352267, 1413868217, 14140409111, 141412724154, 1414170403052, 14141919829640, 141420277272713, 1414208167563878, 14142108649717545, 141421221367320690, 1414212888023339560, 14142132251982630599, 141421339378569021517]

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

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