A342575 - cp's OEIS frontend

A342575 a(n) is the exponent of the least power of 2 such that the concatenated digits of the decimal expansion of 2^n are a proper substring of the concatenated digits of the decimal expansion of 2^a(n).

n	a(n)
0	4
1	5
2	6
3	7
4	14
5	15
6	26
7	102
8	103
9	104
10	224
11	103
12	104
13	105
14	506
15	507
16	452
17	1169
18	1170
19	1171
20	8228
21	10419
22	15186
23	5227
24	16619
25	16620
26	16621
27	25102
28	130090
29	62640
30	330791
31	330792
32	351403
33	273100
34	681504
35	649069
36	352375
37	3045104
38	3045105
39	3635007
40	9532211
41	7819691
42	3091425
43	3091426

[4, 5, 6, 7, 14, 15, 26, 102, 103, 104, 224, 103, 104, 105, 506, 507, 452, 1169, 1170, 1171, 8228, 10419, 15186, 5227, 16619, 16620, 16621, 25102, 130090, 62640, 330791, 330792, 351403, 273100, 681504, 649069, 352375, 3045104, 3045105, 3635007, 9532211, 7819691, 3091425, 3091426]

cp's OEIS Frontend

A342575 a(n) is the exponent of the least power of 2 such that the concatenated digits of the decimal expansion of 2^n are a proper substring of the concatenated digits of the decimal expansion of 2^a(n).

Table of values

List of values