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.

A117949 Index of pentagonal numbers whose sum of divisors is square.

Table of values

n a(n)
1 1
2 4
3 7
4 12
5 21
6 23
7 27
8 31
9 71
10 79
11 89
12 151
13 168
14 199
15 223
16 232
17 239
18 263
19 311
20 324
21 336
22 345
23 359
24 390
25 463
26 479
27 497
28 540
29 599
30 743
31 751
32 823
33 858
34 863
35 911
36 991
37 1031
38 1063
39 1103
40 1151
41 1302
42 1303
43 1343
44 1399
45 1471
46 1540
47 1583
48 1687
49 1759
50 1802
51 1823

List of values

[1, 4, 7, 12, 21, 23, 27, 31, 71, 79, 89, 151, 168, 199, 223, 232, 239, 263, 311, 324, 336, 345, 359, 390, 463, 479, 497, 540, 599, 743, 751, 823, 858, 863, 911, 991, 1031, 1063, 1103, 1151, 1302, 1303, 1343, 1399, 1471, 1540, 1583, 1687, 1759, 1802, 1823]

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

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