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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.

A048362 a(n) is the index of the smallest triangular number containing exactly n 7's.

Table of values

n a(n)
1 12
2 59
3 381
4 3684
5 8692
6 70381
7 122292
8 3762381
9 7453707
10 18856074
11 124721736
12 587838545
13 3996943276
14 18845571218
15 27483805332
16 394393554074
17 1246890354231
18 11642661866667
19 88292437929618
20 184774336842416
21 1158255177391940
22 5962836170393707
23 37870196138329618
24 59623111421253050
25 107479087154457892

List of values

[12, 59, 381, 3684, 8692, 70381, 122292, 3762381, 7453707, 18856074, 124721736, 587838545, 3996943276, 18845571218, 27483805332, 394393554074, 1246890354231, 11642661866667, 88292437929618, 184774336842416, 1158255177391940, 5962836170393707, 37870196138329618, 59623111421253050, 107479087154457892]

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

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