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.

A338105 a(n) is the least integer that can be expressed as the difference of two n-gonal numbers in exactly n ways.

Table of values

n a(n)
3 9
4 96
5 1330
6 4725
7 21021
8 22400
9 421515
10 675675
11 5370365
12 576576
13 10790325
14 39255125
15 51548805
16 7286400
17 978624647
18 144729585
19 649593945
20 125245120
21 1109593485
22 4519064403
23 13908638315
24 253955520
25 8860666815
26 30587913125
27 33144736086
28 859541760
29 147839441750

List of values

[9, 96, 1330, 4725, 21021, 22400, 421515, 675675, 5370365, 576576, 10790325, 39255125, 51548805, 7286400, 978624647, 144729585, 649593945, 125245120, 1109593485, 4519064403, 13908638315, 253955520, 8860666815, 30587913125, 33144736086, 859541760, 147839441750]

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

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