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.

A076139 Triangular numbers that are one-third of another triangular number: T(m) such that 3*T(m) = T(k) for some k.

Table of values

n a(n)
0 0
1 1
2 15
3 210
4 2926
5 40755
6 567645
7 7906276
8 110120220
9 1533776805
10 21362755051
11 297544793910
12 4144264359690
13 57722156241751
14 803965923024825
15 11197800766105800
16 155965244802456376
17 2172315626468283465
18 30256453525753512135
19 421418033734080886426

List of values

[0, 1, 15, 210, 2926, 40755, 567645, 7906276, 110120220, 1533776805, 21362755051, 297544793910, 4144264359690, 57722156241751, 803965923024825, 11197800766105800, 155965244802456376, 2172315626468283465, 30256453525753512135, 421418033734080886426]

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

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