A177929 - cp's OEIS frontend

A177929 a(1)=4. a(n+1) = a(n)+d-1, where d is the smallest prime divisor of (a(n)-1)*(a(n)+1).

n	a(n)
1	4
2	6
3	10
4	12
5	22
6	24
7	28
8	30
9	58
10	60
11	118
12	120
13	126
14	130
15	132
16	138
17	274
18	276
19	280
20	282
21	562
22	564
23	568
24	570
25	1138
26	1140
27	1146
28	1150
29	1152
30	2302
31	2304
32	2308
33	2310
34	4618
35	4620
36	4650
37	9298
38	9300
39	9316
40	9318
41	9324
42	9328
43	9330
44	9336
45	9340
46	9342
47	18682
48	18684

[4, 6, 10, 12, 22, 24, 28, 30, 58, 60, 118, 120, 126, 130, 132, 138, 274, 276, 280, 282, 562, 564, 568, 570, 1138, 1140, 1146, 1150, 1152, 2302, 2304, 2308, 2310, 4618, 4620, 4650, 9298, 9300, 9316, 9318, 9324, 9328, 9330, 9336, 9340, 9342, 18682, 18684]

cp's OEIS Frontend

A177929 a(1)=4. a(n+1) = a(n)+d-1, where d is the smallest prime divisor of (a(n)-1)*(a(n)+1).

Table of values

List of values