A297644 - cp's OEIS frontend

A297644 Pentagonal numbers (A000326) in which parity of digits alternates.

n	a(n)
1	1
2	5
3	12
4	70
5	92
6	145
7	210
8	852
9	925
10	2147
11	2501
12	3290
13	3432
14	3876
15	4187
16	4347
17	6305
18	6501
19	12105
20	12927
21	25676
22	27270
23	27676
24	45850
25	58707
26	69230
27	69876
28	70525
29	76501
30	78547
31	98945
32	101270
33	123410
34	161212
35	270725
36	349692
37	367290
38	567030
39	707610
40	709672

[1, 5, 12, 70, 92, 145, 210, 852, 925, 2147, 2501, 3290, 3432, 3876, 4187, 4347, 6305, 6501, 12105, 12927, 25676, 27270, 27676, 45850, 58707, 69230, 69876, 70525, 76501, 78547, 98945, 101270, 123410, 161212, 270725, 349692, 367290, 567030, 707610, 709672]

cp's OEIS Frontend

A297644 Pentagonal numbers (A000326) in which parity of digits alternates.

Table of values

List of values