A164794 - cp's OEIS frontend

A164794 a(n) is the smallest number whose English name has the letter "f" in the n-th position, or -1 if no such number exists.

n	a(n)
1	4
2	-1
3	15
4	-1
5	-1
6	44
7	24
8	74
9	-1
10	-1
11	104
12	404
13	115
14	415
15	315
16	144
17	124
18	174
19	324
20	374
21	3074
22	1104
23	1404
24	1115
25	1415
26	1315
27	1144
28	1124
29	1174
30	1324
31	1374
32	3324
33	3374
34	11374
35	13324
36	13374
37	17374
38	23324
39	23374
40	73374
41	101374
42	103324
43	103374
44	111374
45	113324

[4, -1, 15, -1, -1, 44, 24, 74, -1, -1, 104, 404, 115, 415, 315, 144, 124, 174, 324, 374, 3074, 1104, 1404, 1115, 1415, 1315, 1144, 1124, 1174, 1324, 1374, 3324, 3374, 11374, 13324, 13374, 17374, 23324, 23374, 73374, 101374, 103324, 103374, 111374, 113324]

cp's OEIS Frontend

A164794 a(n) is the smallest number whose English name has the letter "f" in the n-th position, or -1 if no such number exists.

Table of values

List of values