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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.

A245783 Numbers n such that the hexagonal number H(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 2
3 57
4 166
5 5561
6 16242
7 544897
8 1591526
9 53394321
10 155953282
11 5232098537
12 15281830086
13 512692262281
14 1497463395122
15 50238609604977
16 146736130891846
17 4922871049025441
18 14378643364005762
19 482391124194888217
20 1408960313541672806
21 47269407300050019801

List of values

[1, 2, 57, 166, 5561, 16242, 544897, 1591526, 53394321, 155953282, 5232098537, 15281830086, 512692262281, 1497463395122, 50238609604977, 146736130891846, 4922871049025441, 14378643364005762, 482391124194888217, 1408960313541672806, 47269407300050019801]

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

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