A309809 - cp's OEIS frontend

A309809 a(n) is the concatenation of n and 2n+1.

n	a(n)
1	13
2	25
3	37
4	49
5	511
6	613
7	715
8	817
9	919
10	1021
11	1123
12	1225
13	1327
14	1429
15	1531
16	1633
17	1735
18	1837
19	1939
20	2041
21	2143
22	2245
23	2347
24	2449
25	2551
26	2653
27	2755
28	2857
29	2959
30	3061
31	3163
32	3265
33	3367
34	3469
35	3571
36	3673
37	3775
38	3877
39	3979
40	4081
41	4183
42	4285
43	4387
44	4489
45	4591
46	4693
47	4795
48	4897

[13, 25, 37, 49, 511, 613, 715, 817, 919, 1021, 1123, 1225, 1327, 1429, 1531, 1633, 1735, 1837, 1939, 2041, 2143, 2245, 2347, 2449, 2551, 2653, 2755, 2857, 2959, 3061, 3163, 3265, 3367, 3469, 3571, 3673, 3775, 3877, 3979, 4081, 4183, 4285, 4387, 4489, 4591, 4693, 4795, 4897]

cp's OEIS Frontend

A309809 a(n) is the concatenation of n and 2n+1.

Table of values

List of values