A081939 - cp's OEIS frontend

A081939 a(1) = 2; a(n+1) is the smallest palindrome > a(n) that has a common factor with a(n).

n	a(n)
1	2
2	4
3	6
4	8
5	22
6	33
7	44
8	55
9	66
10	77
11	88
12	99
13	111
14	141
15	171
16	222
17	232
18	242
19	252
20	262
21	272
22	282
23	292
24	404
25	414
26	424
27	434
28	444
29	454
30	464
31	474
32	484
33	494
34	585
35	595
36	616
37	626
38	636
39	646
40	656
41	666
42	676
43	686
44	696
45	717
46	747
47	777
48	828
49	838
50	848
51	858
52	868
53	878
54	888
55	898

[2, 4, 6, 8, 22, 33, 44, 55, 66, 77, 88, 99, 111, 141, 171, 222, 232, 242, 252, 262, 272, 282, 292, 404, 414, 424, 434, 444, 454, 464, 474, 484, 494, 585, 595, 616, 626, 636, 646, 656, 666, 676, 686, 696, 717, 747, 777, 828, 838, 848, 858, 868, 878, 888, 898]

cp's OEIS Frontend

A081939 a(1) = 2; a(n+1) is the smallest palindrome > a(n) that has a common factor with a(n).

Table of values

List of values

n	a(n)
1	2
2	4
3	6
4	8
5	22
6	33
7	44
8	55
9	66
10	77
11	88
12	99
13	111
14	141
15	171
16	222
17	232
18	242
19	252
20	262
21	272
22	282
23	292
24	404
25	414
26	424
27	434
28	444
29	454
30	464
31	474
32	484
33	494
34	585
35	595
36	616
37	626
38	636
39	646
40	656
41	666
42	676
43	686
44	696
45	717
46	747
47	777
48	828
49	838
50	848
51	858
52	868
53	878
54	888
55	898

n	a(n)
1	2
2	4
3	6
4	8
5	22
6	33
7	44
8	55
9	66
10	77
11	88
12	99
13	111
14	141
15	171
16	222
17	232
18	242
19	252
20	262
21	272
22	282
23	292
24	404
25	414
26	424
27	434
28	444
29	454
30	464
31	474
32	484
33	494
34	585
35	595
36	616
37	626
38	636
39	646
40	656
41	666
42	676
43	686
44	696
45	717
46	747
47	777
48	828
49	838
50	848
51	858
52	868
53	878
54	888
55	898

n	a(n)
1	2
2	4
3	6
4	8
5	22
6	33
7	44
8	55
9	66
10	77
11	88
12	99
13	111
14	141
15	171
16	222
17	232
18	242
19	252
20	262
21	272
22	282
23	292
24	404
25	414
26	424
27	434
28	444
29	454
30	464
31	474
32	484
33	494
34	585
35	595
36	616
37	626
38	636
39	646
40	656
41	666
42	676
43	686
44	696
45	717
46	747
47	777
48	828
49	838
50	848
51	858
52	868
53	878
54	888
55	898