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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.

A048360 a(n) is the index of the smallest triangular number containing exactly n 5's.

Table of values

n a(n)
1 5
2 10
3 105
4 714
5 5010
6 34221
7 103494
8 317885
9 3243010
10 1054130
11 55708989
12 280555005
13 1051237885
14 5206833885
15 30184681729
16 105409283410
17 1053999578610
18 1005540238434
19 8894447217885
20 178132285431643
21 717642746162114
22 3273082806882696
23 10445626412576275
24 33332433321191885
25 105428230332824189

List of values

[5, 10, 105, 714, 5010, 34221, 103494, 317885, 3243010, 1054130, 55708989, 280555005, 1051237885, 5206833885, 30184681729, 105409283410, 1053999578610, 1005540238434, 8894447217885, 178132285431643, 717642746162114, 3273082806882696, 10445626412576275, 33332433321191885, 105428230332824189]

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

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