A152561 Smallest m such that 2^m begins with a 1 and n 0's.
0, 10, 196, 2136, 15437, 70777, 325147, 6432163, 198096465, 15042141867, 76590952427, 82361153417, 578451474249, 6198243909905, 410654730169643, 2178891522315645, 11458333085072746, 112404439328411815, 2539468772213180761, 4415969241540963378, 218809557168391974468
Offset: 0
Examples
2^a(0) = 2^0 = 1 2^a(1) = 2^10 = 1024 2^a(2) = 2^196 = 1004336277661868922... 2^a(3) = 2^2136 = 1000162894137615530... 2^a(4) = 2^15437 = 1000099165462017237... 2^a(5) = 2^70777 = 1000007160137454597...
Links
- Zhao Hui Du, Table of n, a(n) for n = 0..500
Formula
a(n) = A018856(10^n). - Andrew Howroyd, Sep 30 2024
Extensions
a(0)=0 prepended by Pontus von Brömssen, May 11 2021
a(18) and above from Zhao Hui Du, Oct 03 2024