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.

A064271 Numbers k such that sigma(k) - 2k is prime.

Table of values

n a(n)
1 18
2 20
3 36
4 100
5 104
6 196
7 324
8 392
9 464
10 576
11 650
12 784
13 800
14 900
15 968
16 1352
17 1936
18 1952
19 2450
20 2500
21 3136
22 4356
23 4624
24 5184
25 6050
26 6400
27 9216
28 10000
29 10404
30 10816
31 12800
32 13456
33 14400
34 15376
35 15488
36 16928
37 18496
38 20000
39 20736
40 23104
41 26912

List of values

[18, 20, 36, 100, 104, 196, 324, 392, 464, 576, 650, 784, 800, 900, 968, 1352, 1936, 1952, 2450, 2500, 3136, 4356, 4624, 5184, 6050, 6400, 9216, 10000, 10404, 10816, 12800, 13456, 14400, 15376, 15488, 16928, 18496, 20000, 20736, 23104, 26912]

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

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