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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.

A048539 a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 5's.

Table of values

n a(n)
1 7
2 23
3 74
4 2248
5 2292
6 23506
7 50552
8 742667
9 2357022
10 22706949
11 74555050
12 703955648
13 745020507
14 3996943276
15 74333434976
16 244040827632
17 505525029504
18 5963015642907
19 23548897033949
20 156701172827632
21 745354652534976
22 758666893673274
23 7453694087868501
24 77198164845775648
25 505525028614365003

List of values

[7, 23, 74, 2248, 2292, 23506, 50552, 742667, 2357022, 22706949, 74555050, 703955648, 745020507, 3996943276, 74333434976, 244040827632, 505525029504, 5963015642907, 23548897033949, 156701172827632, 745354652534976, 758666893673274, 7453694087868501, 77198164845775648, 505525028614365003]

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

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