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.

A161355 Smallest number whose square begins and ends with the same n digits, and with any other digit(s) in between.

Table of values

n a(n)
1 11
2 173
3 3489
4 16262
5 193744
6 2445865
7 38981039
8 112791955
9 1580178016
10 10578937381
11 36363636364
12 1010690961795
13 14451789007487
14 104501463604086
15 1242844268897055
16 11773101257925379
17 181883353790860701
18 1818181815181818182
19 11678332116788271168

List of values

[11, 173, 3489, 16262, 193744, 2445865, 38981039, 112791955, 1580178016, 10578937381, 36363636364, 1010690961795, 14451789007487, 104501463604086, 1242844268897055, 11773101257925379, 181883353790860701, 1818181815181818182, 11678332116788271168]

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

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