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.

A251927 Numbers n such that the sum of the triangular numbers T(n) and T(n+1) is equal to a heptagonal number H(m) for some m.

Table of values

n a(n)
1 0
2 8
3 76
4 1518
5 12986
6 111034
7 2190396
8 18727244
9 160112392
10 3158550954
11 27004674302
12 230881959670
13 4554628286712
14 38940721617680
15 332931625733188
16 6567770830889190
17 56152493568021698
18 480087173425298866
19 9470720983513926708
20 80971856784365672276

List of values

[0, 8, 76, 1518, 12986, 111034, 2190396, 18727244, 160112392, 3158550954, 27004674302, 230881959670, 4554628286712, 38940721617680, 332931625733188, 6567770830889190, 56152493568021698, 480087173425298866, 9470720983513926708, 80971856784365672276]

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

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