A278981 - cp's OEIS frontend

A278981 a(n) is the first composite number having the same base-n digits as its prime factors (with multiplicity), excluding zero digits (or 0 if no such composite number exists).

n	a(n)
2	15
3	399
4	85
5	318
6	57
7	906
8	85
9	1670
10	1111
11	18193
12	185
13	7205205
14	4119
15	63791
16	4369
17	1548502
18	489
19	258099
20	451
21	408166
22	13315
23	1012985
24	679
25	25841526
26	26533
27	2884373
28	985
29	49101338
30	1057
31	5362755
32	1285
33	2447558
34	179503
35	3091422
36	1387
37	5830693854
38	82311
39	149338
40	2005

[15, 399, 85, 318, 57, 906, 85, 1670, 1111, 18193, 185, 7205205, 4119, 63791, 4369, 1548502, 489, 258099, 451, 408166, 13315, 1012985, 679, 25841526, 26533, 2884373, 985, 49101338, 1057, 5362755, 1285, 2447558, 179503, 3091422, 1387, 5830693854, 82311, 149338, 2005]

cp's OEIS Frontend

A278981 a(n) is the first composite number having the same base-n digits as its prime factors (with multiplicity), excluding zero digits (or 0 if no such composite number exists).

Table of values

List of values