A129120 - cp's OEIS frontend

A129120 Undulating Harshad numbers: numbers divisible by the sum of their own digits with decimal expansions in an abab...ab pattern.

n	a(n)
1	10
2	12
3	18
4	20
5	21
6	24
7	27
8	30
9	36
10	40
11	42
12	45
13	48
14	50
15	54
16	60
17	63
18	70
19	72
20	80
21	81
22	84
23	90
24	171
25	252
26	414
27	828
28	1010
29	1212
30	1818
31	2020
32	2424
33	3030
34	3636
35	4040
36	4848
37	5050
38	5454
39	6060
40	7070
41	7272
42	8080
43	9090
44	10101
45	13131
46	20202
47	23232
48	26262
49	30303
50	39393

[10, 12, 18, 20, 21, 24, 27, 30, 36, 40, 42, 45, 48, 50, 54, 60, 63, 70, 72, 80, 81, 84, 90, 171, 252, 414, 828, 1010, 1212, 1818, 2020, 2424, 3030, 3636, 4040, 4848, 5050, 5454, 6060, 7070, 7272, 8080, 9090, 10101, 13131, 20202, 23232, 26262, 30303, 39393]

cp's OEIS Frontend

A129120 Undulating Harshad numbers: numbers divisible by the sum of their own digits with decimal expansions in an abab...ab pattern.

Table of values

List of values