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.

A033648 Trajectory of 3 under map x->x + (x-with-digits-reversed).

Table of values

n a(n)
0 3
1 6
2 12
3 33
4 66
5 132
6 363
7 726
8 1353
9 4884
10 9768
11 18447
12 92928
13 175857
14 934428
15 1758867
16 9447438
17 17794887
18 96644658
19 182289327
20 906271608
21 1712444217
22 8836886388
23 17673772776
24 85401510447
25 159803020905
26 668823329856
27 1327746658722
28 3606313135953
29 7201626272016

List of values

[3, 6, 12, 33, 66, 132, 363, 726, 1353, 4884, 9768, 18447, 92928, 175857, 934428, 1758867, 9447438, 17794887, 96644658, 182289327, 906271608, 1712444217, 8836886388, 17673772776, 85401510447, 159803020905, 668823329856, 1327746658722, 3606313135953, 7201626272016]

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

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