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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.

A276509 Numbers k in base 10 such that the digits of 2 + k are the digits of 2k written in reverse order.

Table of values

n a(n)
1 2
2 47
3 497
4 4997
5 49997
6 499997
7 4999997
8 49999997
9 499999997
10 4999999997
11 49999999997
12 499999999997
13 4999999999997
14 49999999999997
15 499999999999997
16 4999999999999997
17 49999999999999997
18 499999999999999997
19 4999999999999999997
20 49999999999999999997
21 499999999999999999997

List of values

[2, 47, 497, 4997, 49997, 499997, 4999997, 49999997, 499999997, 4999999997, 49999999997, 499999999997, 4999999999997, 49999999999997, 499999999999997, 4999999999999997, 49999999999999997, 499999999999999997, 4999999999999999997, 49999999999999999997, 499999999999999999997]

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

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