A025721 - cp's OEIS frontend

A025721 Index of 7^n within sequence of numbers of form 3^i*7^j for i >= 0, j >= 1.

n	a(n)
1	1
2	3
3	7
4	13
5	21
6	30
7	41
8	54
9	69
10	85
11	103
12	123
13	145
14	169
15	194
16	221
17	250
18	281
19	313
20	347
21	383
22	421
23	460
24	501
25	544
26	589
27	636
28	684
29	734
30	786
31	840
32	895
33	952
34	1011
35	1072
36	1134
37	1198
38	1264
39	1332
40	1402
41	1473
42	1546
43	1621
44	1698
45	1776
46	1856
47	1938
48	2022
49	2108
50	2195
51	2284

[1, 3, 7, 13, 21, 30, 41, 54, 69, 85, 103, 123, 145, 169, 194, 221, 250, 281, 313, 347, 383, 421, 460, 501, 544, 589, 636, 684, 734, 786, 840, 895, 952, 1011, 1072, 1134, 1198, 1264, 1332, 1402, 1473, 1546, 1621, 1698, 1776, 1856, 1938, 2022, 2108, 2195, 2284]

cp's OEIS Frontend

A025721 Index of 7^n within sequence of numbers of form 3^i*7^j for i >= 0, j >= 1.

Table of values

List of values