5-uples of practical numbers
A 5-uple of practical numbers is a 5-uple (m-6, m-2, m, m+2,
m+6) of numbers, all practicals.
It is unknown whether there exist infinitely many such 5-uples.
This list shows practical numbers m
such that m-6, m-2, m+2, and m+6 are practical.
Table no. 1
|
1
|
18
|
|
2
|
30
|
|
3
|
198
|
|
4
|
306
|
|
5
|
462
|
|
6
|
1482
|
|
7
|
2550
|
|
8
|
4422
|
|
9
|
17298
|
|
10
|
23322
|
|
11
|
23550
|
|
12
|
40350
|
|
13
|
52578
|
|
14
|
67938
|
|
15
|
88506
|
|
16
|
92202
|
|
17
|
96222
|
|
18
|
123006
|
|
19
|
131070
|
|
20
|
219102
|
Table no.
2
|
21
|
226182
|
|
22
|
237690
|
|
23
|
277506
|
|
24
|
312702
|
|
25
|
359658
|
|
26
|
432822
|
|
27
|
526878
|
|
28
|
533370
|
|
29
|
584166
|
|
30
|
659934
|
|
31
|
1032858
|
|
32
|
1051650
|
|
33
|
1140414
|
|
34
|
1142658
|
|
35
|
1243170
|
|
36
|
1255422
|
(Giuseppe Melfi - melfi@dm.unipi.it)
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Department of Mathematics of the University of Pisa