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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.

A267939 Number x = concat(MSD(x),b), where MSD = A000030 stands for Most Significant Digit, such that MSD(x)*b is equal to the reverse of x.

Table of values

n a(n)
1 351
2 621
3 886
4 920781
5 3524751
6 338752611
7 35247524751
8 920780120781
9 920879219781
10 3387524752611
11 3526124738751
12 338738752612611
13 352475247524751
14 33875247524752611
15 35247387526124751
16 35261247524738751
17 920780120780120781
18 920780219879120781
19 920879120780219781
20 920879219879219781

List of values

[351, 621, 886, 920781, 3524751, 338752611, 35247524751, 920780120781, 920879219781, 3387524752611, 3526124738751, 338738752612611, 352475247524751, 33875247524752611, 35247387526124751, 35261247524738751, 920780120780120781, 920780219879120781, 920879120780219781, 920879219879219781]

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

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