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.

A253305 Numbers n such that the octagonal number O(n) is equal to the sum of the heptagonal numbers H(m) and H(m+1) for some m.

Table of values

n a(n)
1 2
2 29
3 100
4 1777
5 6178
6 110125
7 382916
8 6825953
9 23734594
10 423098941
11 1471161892
12 26225308369
13 91188302690
14 1625546019917
15 5652203604868
16 100757627926465
17 350345435199106
18 6245347385420893
19 21715764778739684
20 387110780268168881
21 1346027070846661282

List of values

[2, 29, 100, 1777, 6178, 110125, 382916, 6825953, 23734594, 423098941, 1471161892, 26225308369, 91188302690, 1625546019917, 5652203604868, 100757627926465, 350345435199106, 6245347385420893, 21715764778739684, 387110780268168881, 1346027070846661282]

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

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