A063269 - cp's OEIS frontend

A063269 a(1) = 3, a(n) = concatenation of two closest factors of a(n-1) whose product equals a(n-1) or if a(n-1) is a prime then the concatenation of 1 and a(n-1).

n	a(n)
1	3
2	13
3	113
4	1113
5	2153
6	12153
7	34051
8	172003
9	1311313
10	3473779
11	5365543
12	16913173
13	34014973
14	229148537
15	479347809
16	1807726517
17	11807726517
18	20529575173
19	69833293981
20	179443389167
21	230839777353
22	376946592451

[3, 13, 113, 1113, 2153, 12153, 34051, 172003, 1311313, 3473779, 5365543, 16913173, 34014973, 229148537, 479347809, 1807726517, 11807726517, 20529575173, 69833293981, 179443389167, 230839777353, 376946592451]

cp's OEIS Frontend

A063269 a(1) = 3, a(n) = concatenation of two closest factors of a(n-1) whose product equals a(n-1) or if a(n-1) is a prime then the concatenation of 1 and a(n-1).

Table of values

List of values