A025723 - cp's OEIS frontend

A025723 Index of 7^n within sequence of numbers of form 5^i*7^j.

n	a(n)
0	1
1	3
2	6
3	10
4	15
5	22
6	30
7	39
8	49
9	60
10	73
11	87
12	102
13	118
14	135
15	154
16	174
17	195
18	217
19	240
20	265
21	291
22	318
23	346
24	376
25	407
26	439
27	472
28	506
29	542
30	579
31	617
32	656
33	696
34	738
35	781
36	825
37	870
38	916
39	964
40	1013
41	1063
42	1114
43	1166
44	1220
45	1275
46	1331
47	1388
48	1447
49	1507
50	1568
51	1630
52	1693

[1, 3, 6, 10, 15, 22, 30, 39, 49, 60, 73, 87, 102, 118, 135, 154, 174, 195, 217, 240, 265, 291, 318, 346, 376, 407, 439, 472, 506, 542, 579, 617, 656, 696, 738, 781, 825, 870, 916, 964, 1013, 1063, 1114, 1166, 1220, 1275, 1331, 1388, 1447, 1507, 1568, 1630, 1693]

cp's OEIS Frontend

A025723 Index of 7^n within sequence of numbers of form 5^i*7^j.

Table of values

List of values