A375387 - cp's OEIS frontend

A375387 a(n) is the least number k whose sum of digits in base 10 is n and that is palindromic in base n, or -1 if no such number exists.

n	a(n)
3	-1
4	130
5	41
6	123
7	16
8	170
9	-1
10	55
11	155
12	39
13	274
14	239
15	96
16	187
17	494
18	2925
19	685
20	1784
21	1389
22	859
23	599
24	1779
25	1978
26	989
27	6597
28	5887
29	6968
30	8499
31	5989
32	17969
33	29859
34	17899
35	28898
36	435897
37	38989
38	2089469
39	1788960
40	498847
41	2886278
42	487878
43	919996
44	4098689
45	898794
46	1896967

[-1, 130, 41, 123, 16, 170, -1, 55, 155, 39, 274, 239, 96, 187, 494, 2925, 685, 1784, 1389, 859, 599, 1779, 1978, 989, 6597, 5887, 6968, 8499, 5989, 17969, 29859, 17899, 28898, 435897, 38989, 2089469, 1788960, 498847, 2886278, 487878, 919996, 4098689, 898794, 1896967]

cp's OEIS Frontend

A375387 a(n) is the least number k whose sum of digits in base 10 is n and that is palindromic in base n, or -1 if no such number exists.

Table of values

List of values