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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.

A257922 Practical numbers m with m-1 and m+1 both prime, and prime(m)-1 and prime(m)+1 both practical.

Table of values

n a(n)
1 4
2 522
3 1932
4 5100
5 6132
6 6552
7 8220
8 18312
9 18540
10 22110
11 29568
12 45342
13 70488
14 70950
15 92220
16 105360
17 109662
18 114600
19 116532
20 117192
21 123552
22 128982
23 131838
24 132762
25 136710
26 148302
27 149160
28 166848
29 177012
30 183438
31 197340
32 206280
33 233550
34 235008
35 257868
36 272808
37 273900
38 276780
39 279708
40 286590

List of values

[4, 522, 1932, 5100, 6132, 6552, 8220, 18312, 18540, 22110, 29568, 45342, 70488, 70950, 92220, 105360, 109662, 114600, 116532, 117192, 123552, 128982, 131838, 132762, 136710, 148302, 149160, 166848, 177012, 183438, 197340, 206280, 233550, 235008, 257868, 272808, 273900, 276780, 279708, 286590]

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

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