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.

A115907 Numbers k such that sigma(k) plus the k-th prime is a triangular number.

Table of values

n a(n)
1 1
2 2
3 9
4 13
5 21
6 80
7 112
8 129
9 147
10 225
11 308
12 349
13 1063
14 1282
15 1300
16 1635
17 1880
18 2686
19 2956
20 3517
21 3759
22 3907
23 4058
24 5025
25 5196
26 6742
27 7606
28 7708
29 9244
30 10154
31 10596
32 11259
33 11719
34 12687
35 13167
36 13599
37 14081
38 14624
39 15937
40 16437
41 16766
42 18289

List of values

[1, 2, 9, 13, 21, 80, 112, 129, 147, 225, 308, 349, 1063, 1282, 1300, 1635, 1880, 2686, 2956, 3517, 3759, 3907, 4058, 5025, 5196, 6742, 7606, 7708, 9244, 10154, 10596, 11259, 11719, 12687, 13167, 13599, 14081, 14624, 15937, 16437, 16766, 18289]

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

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