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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.

A048364 a(n) is the index of the smallest triangular number containing exactly n 9's.

Table of values

n a(n)
1 13
2 44
3 631
4 1413
5 28282
6 76419
7 282842
8 1414213
9 4471955
10 31616419
11 446313656
12 1414001413
13 6276925986
14 44710913656
15 44721356419
16 632129732586
17 527257052109
18 14141923468538
19 44698881216419
20 199449241362306
21 141421356237309
22 4690415742340969
23 42426404749855955
24 44703449755024186
25 1095435073375871053

List of values

[13, 44, 631, 1413, 28282, 76419, 282842, 1414213, 4471955, 31616419, 446313656, 1414001413, 6276925986, 44710913656, 44721356419, 632129732586, 527257052109, 14141923468538, 44698881216419, 199449241362306, 141421356237309, 4690415742340969, 42426404749855955, 44703449755024186, 1095435073375871053]

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

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