A025720 - cp's OEIS frontend

A025720 Index of 7^n within sequence of numbers of form 2^i*7^j.

n	a(n)
1	1
2	4
3	10
4	19
5	31
6	46
7	63
8	83
9	106
10	132
11	161
12	192
13	226
14	263
15	303
16	346
17	391
18	439
19	490
20	544
21	601
22	660
23	722
24	787
25	855
26	926
27	999
28	1075
29	1154
30	1236
31	1321
32	1409
33	1499
34	1592
35	1688
36	1787
37	1889
38	1993
39	2100
40	2210
41	2323
42	2439
43	2557
44	2678
45	2802
46	2929
47	3059
48	3191
49	3326

[1, 4, 10, 19, 31, 46, 63, 83, 106, 132, 161, 192, 226, 263, 303, 346, 391, 439, 490, 544, 601, 660, 722, 787, 855, 926, 999, 1075, 1154, 1236, 1321, 1409, 1499, 1592, 1688, 1787, 1889, 1993, 2100, 2210, 2323, 2439, 2557, 2678, 2802, 2929, 3059, 3191, 3326]

cp's OEIS Frontend

A025720 Index of 7^n within sequence of numbers of form 2^i*7^j.

Table of values

List of values