A068889 - cp's OEIS frontend

A068889 Triangular numbers with property that digits alternate in parity individually as well as in concatenation with previous terms.

n	a(n)
1	1
2	6
3	10
4	36
5	78
6	105
7	210
8	325
9	496
10	561
11	630
12	703
13	2145
14	2701
15	6105
16	6903
17	8385
18	23436
19	30381
20	41616
21	50721
22	67896
23	70125
24	81810
25	90525
26	210925
27	214185
28	230181
29	232903
30	254541
31	258121
32	290703
33	414505
34	454581
35	490545
36	498501
37	634501
38	674541
39	810901
40	852165

[1, 6, 10, 36, 78, 105, 210, 325, 496, 561, 630, 703, 2145, 2701, 6105, 6903, 8385, 23436, 30381, 41616, 50721, 67896, 70125, 81810, 90525, 210925, 214185, 230181, 232903, 254541, 258121, 290703, 414505, 454581, 490545, 498501, 634501, 674541, 810901, 852165]

cp's OEIS Frontend

A068889 Triangular numbers with property that digits alternate in parity individually as well as in concatenation with previous terms.

Table of values

List of values