A351820 - cp's OEIS frontend

A351820 a(1) = 1, a(2) = 2, a(3) = 3 and a(n) is the smallest number not included earlier that divides the concatenation a(n-3), a(n-2), a(n-1).

n	a(n)
1	1
2	2
3	3
4	41
5	2341
6	9
7	1374473
8	7
9	123
10	13
11	49
12	53
13	91
14	689
15	5391689
16	167
17	8429
18	17
19	11
20	21
21	211
22	37
23	89
24	2113789
25	47
26	89211378947
27	1336372981
28	43
29	169
30	7213
31	47966357
32	121
33	13681
34	29863
35	9848521381
36	173
37	23
38	2997821
39	29
40	39
41	19
42	97973
43	130665991
44	727
45	251
46	817

[1, 2, 3, 41, 2341, 9, 1374473, 7, 123, 13, 49, 53, 91, 689, 5391689, 167, 8429, 17, 11, 21, 211, 37, 89, 2113789, 47, 89211378947, 1336372981, 43, 169, 7213, 47966357, 121, 13681, 29863, 9848521381, 173, 23, 2997821, 29, 39, 19, 97973, 130665991, 727, 251, 817]

cp's OEIS Frontend

A351820 a(1) = 1, a(2) = 2, a(3) = 3 and a(n) is the smallest number not included earlier that divides the concatenation a(n-3), a(n-2), a(n-1).

Table of values

List of values