A253253 - cp's OEIS frontend

A253253 a(n) = smallest divisor of the concatenation of n and n+1 that did not occur earlier.

n	a(n)
1	1
2	23
3	2
4	3
5	4
6	67
7	6
8	89
9	5
10	337
11	8
12	1213
13	9
14	283
15	379
16	7
17	859
18	17
19	10
20	43
21	1061
22	13
23	14
24	25
25	421
26	37
27	11
28	41
29	293
30	433
31	12
32	53
33	1667
34	15
35	16
36	3637
37	21
38	349
39	20
40	449
41	19
42	4243
43	24
44	35
45	2273
46	1549
47	1187
48	373
49	18
50	5051
51	28
52	51
53	2677
54	1091
55	463
56	5657
57	2879
58	27

[1, 23, 2, 3, 4, 67, 6, 89, 5, 337, 8, 1213, 9, 283, 379, 7, 859, 17, 10, 43, 1061, 13, 14, 25, 421, 37, 11, 41, 293, 433, 12, 53, 1667, 15, 16, 3637, 21, 349, 20, 449, 19, 4243, 24, 35, 2273, 1549, 1187, 373, 18, 5051, 28, 51, 2677, 1091, 463, 5657, 2879, 27]

cp's OEIS Frontend

A253253 a(n) = smallest divisor of the concatenation of n and n+1 that did not occur earlier.

Table of values

List of values