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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.

A119238 Numbers k such that the decimal representation of k is contained as substring in that of the k-th triangular number.

Table of values

n a(n)
1 1
2 5
3 19
4 25
5 199
6 625
7 1999
8 2102
9 5582
10 9376
11 9909
12 10100
13 16833
14 19999
15 41012
16 55741
17 74491
18 83885
19 88102
20 90625
21 151774
22 199999
23 201002
24 558257
25 626522
26 740312
27 798097
28 810062
29 890625
30 1001000
31 1030563
32 1668333
33 1999999
34 2646751

List of values

[1, 5, 19, 25, 199, 625, 1999, 2102, 5582, 9376, 9909, 10100, 16833, 19999, 41012, 55741, 74491, 83885, 88102, 90625, 151774, 199999, 201002, 558257, 626522, 740312, 798097, 810062, 890625, 1001000, 1030563, 1668333, 1999999, 2646751]

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

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