cp's OEIS Frontend

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.

A048357 a(n) is the index of the smallest triangular number containing exactly n 2's.

Table of values

n a(n)
1 6
2 49
3 215
4 651
5 6651
6 66367
7 206020
8 635959
9 6651759
10 21411348
11 66651759
12 666816649
13 666651759
14 6666651759
15 64687340681
16 210818509825
17 1115546688777
18 6666665142651
19 21411315850840
20 66642647340651
21 494412868404984
22 2108185106684051
23 21083748539063076
24 209872546190692806
25 494534695369742950

List of values

[6, 49, 215, 651, 6651, 66367, 206020, 635959, 6651759, 21411348, 66651759, 666816649, 666651759, 6666651759, 64687340681, 210818509825, 1115546688777, 6666665142651, 21411315850840, 66642647340651, 494412868404984, 2108185106684051, 21083748539063076, 209872546190692806, 494534695369742950]

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

Content is available under The OEIS End-User License Agreement.