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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.

A253304 Numbers n such that the sum of the heptagonal numbers H(n) and H(n+1) is equal to the octagonal number O(m) for some m.

Table of values

n a(n)
1 1
2 22
3 77
4 1376
5 4785
6 85302
7 296605
8 5287360
9 18384737
10 327731030
11 1139557101
12 20314036512
13 70634155537
14 1259142532726
15 4378178086205
16 78046522992512
17 271376407189185
18 4837625283003030
19 16820959067643277
20 299854721023195360
21 1042628085786694001

List of values

[1, 22, 77, 1376, 4785, 85302, 296605, 5287360, 18384737, 327731030, 1139557101, 20314036512, 70634155537, 1259142532726, 4378178086205, 78046522992512, 271376407189185, 4837625283003030, 16820959067643277, 299854721023195360, 1042628085786694001]

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

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