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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.

A249164 Numbers n such that the triangular number T(n) is equal to the sum of the pentagonal numbers P(m) and P(m+1) for some m.

Table of values

n a(n)
1 1
2 3
3 113
4 331
5 11121
6 32483
7 1089793
8 3183051
9 106788641
10 311906563
11 10464197073
12 30563660171
13 1025384524561
14 2994926790243
15 100477219209953
16 293472261783691
17 9845742098050881
18 28757286728011523
19 964782248389776433
20 2817920627083345611
21 94538814600100039601

List of values

[1, 3, 113, 331, 11121, 32483, 1089793, 3183051, 106788641, 311906563, 10464197073, 30563660171, 1025384524561, 2994926790243, 100477219209953, 293472261783691, 9845742098050881, 28757286728011523, 964782248389776433, 2817920627083345611, 94538814600100039601]

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

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