A253975 - cp's OEIS frontend

A253975 a(n) is the smallest number k representable as x*y+x+y, where x>=y>1, in exactly n ways, or -1 if no such k exists.

n	a(n)
1	8
2	23
3	35
4	59
5	191
6	119
7	179
8	239
9	575
10	359
11	1295
12	899
13	719
14	839
15	9215
16	1259
17	17324
18	1679
19	2879
20	15359
21	3599
22	2519
23	6479
24	61439
25	6299
26	6719
27	280664
28	5039
29	155924
30	7559
31	46079
32	983039
33	25919
34	10079
35	225224
36	32399
37	184319
38	15119
39	44099
40	20159
41	1403324
42	107519
43	25199

[8, 23, 35, 59, 191, 119, 179, 239, 575, 359, 1295, 899, 719, 839, 9215, 1259, 17324, 1679, 2879, 15359, 3599, 2519, 6479, 61439, 6299, 6719, 280664, 5039, 155924, 7559, 46079, 983039, 25919, 10079, 225224, 32399, 184319, 15119, 44099, 20159, 1403324, 107519, 25199]

cp's OEIS Frontend

A253975 a(n) is the smallest number k representable as x*y+x+y, where x>=y>1, in exactly n ways, or -1 if no such k exists.

Table of values

List of values