A374225 - cp's OEIS frontend

A374225 Irregular triangle read by rows: T(n,k), n > 1 and k <= n, is the smallest composite number x whose set of digits and the set of digits in all prime factors of x, when written in base n, contain exactly k digits in common, or -1 if no such number exists.

n	a(n)
2	-1
3	9
4	4
5	4
6	8
7	6
8	15
9	4
10	6
11	14
12	30
13	114
14	4
15	12
16	10
17	35
18	190
19	894
20	4
21	8
22	33
23	188
24	377
25	2355
26	13155
27	4
28	16
29	14
30	66
31	462
32	3269
33	22971
34	127041
35	4
36	10
37	66
38	85
39	762
40	5359
41	36526
42	279806
43	2219826
44	4
45	12
46	39
47	102
48	1118
49	9096
50	62959
51	572746
52	5053742
53	44489860
54	4
55	12
56	95
57	132

[-1, 9, 4, 4, 8, 6, 15, 4, 6, 14, 30, 114, 4, 12, 10, 35, 190, 894, 4, 8, 33, 188, 377, 2355, 13155, 4, 16, 14, 66, 462, 3269, 22971, 127041, 4, 10, 66, 85, 762, 5359, 36526, 279806, 2219826, 4, 12, 39, 102, 1118, 9096, 62959, 572746, 5053742, 44489860, 4, 12, 95, 132]

cp's OEIS Frontend

A374225 Irregular triangle read by rows: T(n,k), n > 1 and k <= n, is the smallest composite number x whose set of digits and the set of digits in all prime factors of x, when written in base n, contain exactly k digits in common, or -1 if no such number exists.

Table of values

List of values