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

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Example

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...

Crossrefs

Cf. A000079.

Sequence in context: A294047 A239768 A239769 * A224298 A222499 A097127

Adjacent sequences: A152558 A152559 A152560 * A152562 A152563 A152564

Keyword

base,nonn

Author

Jon E. Schoenfield, Dec 07 2008

Extensions

a(0)=0 prepended by Pontus von Brömssen, May 11 2021

Status

approved