A063383 - cp's OEIS frontend

A063383 a(1) = 6, a(n) = concatenation of two closest divisors 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	6
2	23
3	123
4	341
5	1131
6	2939
7	12939
8	57227
9	89643
10	329881
11	1073083
12	1197553
13	7171079
14	17171079
15	57301247
16	208327509
17	1171780577
18	1219684137
19	1478297171
20	2587571433
21	2795835979
22	8663322733
23	13666409441
24	113666409441
25	1030771102733
26	2114885171103
27	6993025586797

[6, 23, 123, 341, 1131, 2939, 12939, 57227, 89643, 329881, 1073083, 1197553, 7171079, 17171079, 57301247, 208327509, 1171780577, 1219684137, 1478297171, 2587571433, 2795835979, 8663322733, 13666409441, 113666409441, 1030771102733, 2114885171103, 6993025586797]

cp's OEIS Frontend

A063383 a(1) = 6, a(n) = concatenation of two closest divisors 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