

A031143


Position of rightmost 0 (including leading 0) in 2^A031142(n).


5



1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 15, 16, 21, 22, 23, 24, 25, 26, 36, 38, 54, 57, 59, 93, 115, 119, 120, 121, 136, 138, 164, 174, 176, 191, 196, 212, 217, 227, 233, 249, 250, 260, 268, 275, 308
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


COMMENTS

"Positions" are counted 0,1,2,3,... starting with the least significant digit.


LINKS

Table of n, a(n) for n=1..46.


MATHEMATICA

best = 0; lst = {};
x = Select[Range[0, 10000],
If[(t = First@
First@StringPosition[StringReverse@("0" <> ToString@(2^#)),
"0"]) > best, best = t; AppendTo[lst, t  1]; True] &] ; lst (* Robert Price, Oct 11 2019 *)


CROSSREFS

Cf. A031140, A031141, A031142, A031143.
Sequence in context: A156541 A325663 A277620 * A302594 A055492 A005459
Adjacent sequences: A031140 A031141 A031142 * A031144 A031145 A031146


KEYWORD

nonn


AUTHOR

Matthew Cook, Dan Hoey, Eric W. Weisstein, David W. Wilson


EXTENSIONS

More terms from Dan Hoey
a(42)a(44) from Alan Griffiths, Jan 25 2012
a(45) from Alan Griffiths, Feb 01 2012
a(46) from Alan Griffiths, Mar 09 2012


STATUS

approved



