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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.

A199809 a(n) is the smallest number which is the sum of two positive n-gonal numbers in more than one way.

Table of values

n a(n)
3 16
4 50
5 211
6 384
7 470
8 1053
9 1500
10 2242
11 3197
12 3277
13 5501
14 6780
15 8710
16 9896
17 10584
18 15198
19 15395
20 21237
21 23346
22 28696
23 33596
24 37725
25 40795
26 48474
27 55369
28 54146
29 69113
30 75732
31 84962
32 92541
33 95623
34 98672
35 123575
36 127317
37 146639
38 141066
39 154975
40 173416
41 201032

List of values

[16, 50, 211, 384, 470, 1053, 1500, 2242, 3197, 3277, 5501, 6780, 8710, 9896, 10584, 15198, 15395, 21237, 23346, 28696, 33596, 37725, 40795, 48474, 55369, 54146, 69113, 75732, 84962, 92541, 95623, 98672, 123575, 127317, 146639, 141066, 154975, 173416, 201032]

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

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