A061916 - cp's OEIS frontend

A061916 Obtain m by omitting trailing zeros from n; a(n) = smallest k such that k*m is a palindrome with even digits, or -1 if no such multiple exists.

n	a(n)
0	1
1	2
2	1
3	2
4	1
5	-1
6	1
7	98
8	1
9	74
10	2
11	2
12	37
13	154
14	49
15	-1
16	29
17	38
18	37
19	34
20	1
21	286
22	1
23	36
24	37
25	-1
26	77
27	329144
28	31
29	16
30	2
31	28
32	132
33	2
34	19
35	-1
36	23
37	6
38	17
39	154
40	1
41	542
42	143
43	1602
44	1
45	-1
46	18
47	6
48	88
49	14
50	-1
51	824
52	77
53	8
54	164572
55	-1
56	143
57	1198
58	8
59	1154
60	1
61	1126
62	14
63	962
64	66
65	-1
66	1
67	998
68	121
69	12
70	98
71	65984
72	592
73	274
74	3
75	-1
76	529
77	26
78	77
79	358

[1, 2, 1, 2, 1, -1, 1, 98, 1, 74, 2, 2, 37, 154, 49, -1, 29, 38, 37, 34, 1, 286, 1, 36, 37, -1, 77, 329144, 31, 16, 2, 28, 132, 2, 19, -1, 23, 6, 17, 154, 1, 542, 143, 1602, 1, -1, 18, 6, 88, 14, -1, 824, 77, 8, 164572, -1, 143, 1198, 8, 1154, 1, 1126, 14, 962, 66, -1, 1, 998, 121, 12, 98, 65984, 592, 274, 3, -1, 529, 26, 77, 358]

cp's OEIS Frontend

A061916 Obtain m by omitting trailing zeros from n; a(n) = smallest k such that k*m is a palindrome with even digits, or -1 if no such multiple exists.

Table of values

List of values