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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.

A048547 a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 9's.

Table of values

n a(n)
1 9
2 31
3 890
4 2234
5 14131
6 30331
7 173031
8 969520
9 9958890
10 31617890
11 360542549
12 547631234
13 3316547890
14 17318486343
15 114017542334
16 356363452109
17 3065925634968
18 9995498986343
19 44045425415132
20 173193446755643
21 1414213562370264
22 4471015432706534
23 31575306806579083
24 171463720944111031
25 141138230008594765

List of values

[9, 31, 890, 2234, 14131, 30331, 173031, 969520, 9958890, 31617890, 360542549, 547631234, 3316547890, 17318486343, 114017542334, 356363452109, 3065925634968, 9995498986343, 44045425415132, 173193446755643, 1414213562370264, 4471015432706534, 31575306806579083, 171463720944111031, 141138230008594765]

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

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