A171785 - cp's OEIS frontend

A171785 Start with a(1) = 1; then a(n) = smallest number > a(n-1) such that a(n) divides concat(a(1), a(2), ..., a(n)).

n	a(n)
1	1
2	2
3	3
4	5
5	10
6	12
7	15
8	20
9	25
10	30
11	39
12	44
13	50
14	100
15	101
16	125
17	150
18	188
19	200
20	220
21	230
22	250
23	272
24	304
25	320
26	370
27	376
28	400
29	500
30	525
31	600
32	615
33	625
34	1000
35	1250
36	1487
37	1500
38	1590
39	1696
40	1750
41	2000
42	2245
43	2500
44	3000
45	3090
46	3125
47	3800
48	4000
49	5000
50	5725
51	6122
52	7025

[1, 2, 3, 5, 10, 12, 15, 20, 25, 30, 39, 44, 50, 100, 101, 125, 150, 188, 200, 220, 230, 250, 272, 304, 320, 370, 376, 400, 500, 525, 600, 615, 625, 1000, 1250, 1487, 1500, 1590, 1696, 1750, 2000, 2245, 2500, 3000, 3090, 3125, 3800, 4000, 5000, 5725, 6122, 7025]

cp's OEIS Frontend

A171785 Start with a(1) = 1; then a(n) = smallest number > a(n-1) such that a(n) divides concat(a(1), a(2), ..., a(n)).

Table of values

List of values