A281189 - cp's OEIS frontend

A281189 a(n) is the first composite number having the same base-(2n) digits as its prime factors (with multiplicity), excluding zero digits (or 0 if no such composite number exists).

n	a(n)
1	15
2	85
3	57
4	85
5	1111
6	185
7	4119
8	4369
9	489
10	451
11	13315
12	679
13	26533
14	985
15	1057
16	1285
17	179503
18	1387
19	82311
20	2005
21	2649
22	2047
23	4663957
24	2509
25	2761
26	3385
27	3097
28	3277
29	243895
30	4207
31	16246817
32	4369
33	4577
34	471651
35	5401
36	5629
37	607839
38	466429
39	483731
40	6817
41	1009273
42	10587
43	1132547
44	8119
45	8401
46	798731
47	990583
48	9809
49	1411791
50	1062517

[15, 85, 57, 85, 1111, 185, 4119, 4369, 489, 451, 13315, 679, 26533, 985, 1057, 1285, 179503, 1387, 82311, 2005, 2649, 2047, 4663957, 2509, 2761, 3385, 3097, 3277, 243895, 4207, 16246817, 4369, 4577, 471651, 5401, 5629, 607839, 466429, 483731, 6817, 1009273, 10587, 1132547, 8119, 8401, 798731, 990583, 9809, 1411791, 1062517]

cp's OEIS Frontend

A281189 a(n) is the first composite number having the same base-(2n) digits as its prime factors (with multiplicity), excluding zero digits (or 0 if no such composite number exists).

Table of values

List of values