A063403 - cp's OEIS frontend

A063403 a(1) = 8, 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	8
2	24
3	46
4	223
5	1223
6	11223
7	87129
8	189461
9	414621
10	2072003
11	12072003
12	34024001
13	163920759
14	354640253
15	1074732999
16	7377145687
17	17377145687
18	57053304579
19	393145173803
20	834736688841
21	8062231035367
22	26899299722333
23	27745499695017

[8, 24, 46, 223, 1223, 11223, 87129, 189461, 414621, 2072003, 12072003, 34024001, 163920759, 354640253, 1074732999, 7377145687, 17377145687, 57053304579, 393145173803, 834736688841, 8062231035367, 26899299722333, 27745499695017]

cp's OEIS Frontend

A063403 a(1) = 8, 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