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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.

A048358 a(n) is the index of the smallest triangular number containing exactly n 3's.

Table of values

n a(n)
1 2
2 77
3 257
4 2570
5 816
6 25808
7 163299
8 812816
9 2463060
10 24629808
11 246306030
12 791999183
13 812812816
14 2581876578
15 81649658057
16 247924719918
17 812812812816
18 8128140492564
19 25819877355763
20 81708543315045
21 816129320553227
22 2581981926944235
23 8164822512869870
24 16329935292787435
25 258071204644507494

List of values

[2, 77, 257, 2570, 816, 25808, 163299, 812816, 2463060, 24629808, 246306030, 791999183, 812812816, 2581876578, 81649658057, 247924719918, 812812812816, 8128140492564, 25819877355763, 81708543315045, 816129320553227, 2581981926944235, 8164822512869870, 16329935292787435, 258071204644507494]

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

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