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.

A292063 Triangular numbers n such that psi(n) is also a triangular number, where psi is the Dedekind psi function (A001615).

Table of values

n a(n)
1 1
2 780
3 2775
4 5050
5 474825
6 681528
7 1727011
8 5286126
9 5911641
10 6604795
11 17325441
12 21612025
13 27799696
14 45025305
15 386767578
16 1538599128
17 2086160121
18 3679490220
19 5718242211
20 7092226351
21 8019794628
22 16505718895
23 36604197735
24 55541611986
25 56693041356
26 89369984476

List of values

[1, 780, 2775, 5050, 474825, 681528, 1727011, 5286126, 5911641, 6604795, 17325441, 21612025, 27799696, 45025305, 386767578, 1538599128, 2086160121, 3679490220, 5718242211, 7092226351, 8019794628, 16505718895, 36604197735, 55541611986, 56693041356, 89369984476]

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

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