A374376 - cp's OEIS frontend

A374376 Array read by downward antidiagonals: T(k,n) is the least number that has k prime factors (counted with multiplicity) and is the concatenation of n primes, or -1 if there is no such number.

n	a(n)
1	2
2	23
3	-1
4	223
5	22
6	-1
7	2237
8	235
9	27
10	-1
11	22273
12	2227
13	222
14	132
15	-1
16	222323
17	22223
18	2222
19	225
20	32
21	-1
22	2222273
23	222223
24	22222
25	2223
26	252
27	729
28	-1
29	22222223
30	2222557
31	222227
32	22225
33	2322
34	352
35	192
36	-1
37	222222227
38	22222237
39	2222222
40	222225
41	22232
42	2232
43	2352
44	2112
45	-1
46	2222222377
47	222222223

[2, 23, -1, 223, 22, -1, 2237, 235, 27, -1, 22273, 2227, 222, 132, -1, 222323, 22223, 2222, 225, 32, -1, 2222273, 222223, 22222, 2223, 252, 729, -1, 22222223, 2222557, 222227, 22225, 2322, 352, 192, -1, 222222227, 22222237, 2222222, 222225, 22232, 2232, 2352, 2112, -1, 2222222377, 222222223]

cp's OEIS Frontend

A374376 Array read by downward antidiagonals: T(k,n) is the least number that has k prime factors (counted with multiplicity) and is the concatenation of n primes, or -1 if there is no such number.

Table of values

List of values