A249399 - cp's OEIS frontend

A249399 Start with a(1) = 1 then a(n) = smallest number, not already in the sequence, such that a(n) divides concat(a(n-1),a(n)).

n	a(n)
1	1
2	2
3	4
4	5
5	10
6	20
7	8
8	16
9	25
10	50
11	40
12	32
13	64
14	80
15	100
16	125
17	200
18	160
19	128
20	250
21	400
22	320
23	256
24	500
25	625
26	1000
27	800
28	640
29	512
30	1024
31	1250
32	2000
33	1280
34	1600
35	2500
36	3125
37	5000
38	3200
39	2048
40	2560
41	4000
42	6250
43	10000
44	6400
45	4096
46	5120
47	8000
48	10240
49	8192
50	12500
51	15625

[1, 2, 4, 5, 10, 20, 8, 16, 25, 50, 40, 32, 64, 80, 100, 125, 200, 160, 128, 250, 400, 320, 256, 500, 625, 1000, 800, 640, 512, 1024, 1250, 2000, 1280, 1600, 2500, 3125, 5000, 3200, 2048, 2560, 4000, 6250, 10000, 6400, 4096, 5120, 8000, 10240, 8192, 12500, 15625]

cp's OEIS Frontend

A249399 Start with a(1) = 1 then a(n) = smallest number, not already in the sequence, such that a(n) divides concat(a(n-1),a(n)).

Table of values

List of values