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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.

A260855 Base-5 representation of a(n) is the concatenation of the base-5 representations of 1, 2, ..., n, n-1, ..., 1.

Table of values

n a(n)
0 0
1 1
2 36
3 961
4 24336
5 3034961
6 1896581836
7 1185364159961
8 740852620019336
9 463032888020409961
10 289395555025471581836
11 180872221891237629784961
12 113045138682031465901269336
13 70653211676269864870442284961
14 44158257297668670511080159081836

List of values

[0, 1, 36, 961, 24336, 3034961, 1896581836, 1185364159961, 740852620019336, 463032888020409961, 289395555025471581836, 180872221891237629784961, 113045138682031465901269336, 70653211676269864870442284961, 44158257297668670511080159081836]

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

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