A258838 - cp's OEIS frontend

A258838 Practical numbers q with q-1 and q+1 twin primes: "Sandwiches of the second kind".

n	a(n)
1	4
2	6
3	12
4	18
5	30
6	42
7	60
8	72
9	108
10	150
11	180
12	192
13	198
14	228
15	240
16	270
17	312
18	348
19	420
20	432
21	462
22	522
23	570
24	600
25	660
26	810
27	828
28	858
29	882
30	1020
31	1032
32	1050
33	1092
34	1152
35	1230
36	1290
37	1302
38	1320
39	1428
40	1452
41	1482
42	1488
43	1620
44	1722
45	1872
46	1932
47	1950
48	1998
49	2028
50	2088
51	2112
52	2130
53	2142
54	2268
55	2310
56	2340
57	2550
58	2592
59	2688
60	2730

[4, 6, 12, 18, 30, 42, 60, 72, 108, 150, 180, 192, 198, 228, 240, 270, 312, 348, 420, 432, 462, 522, 570, 600, 660, 810, 828, 858, 882, 1020, 1032, 1050, 1092, 1152, 1230, 1290, 1302, 1320, 1428, 1452, 1482, 1488, 1620, 1722, 1872, 1932, 1950, 1998, 2028, 2088, 2112, 2130, 2142, 2268, 2310, 2340, 2550, 2592, 2688, 2730]

cp's OEIS Frontend

A258838 Practical numbers q with q-1 and q+1 twin primes: "Sandwiches of the second kind".

Table of values

List of values