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A145523
Least integer k > 0 such that A000041(k) is divisible by 2^n.
2
1, 2, 11, 11, 15, 66, 66, 96, 96, 96, 96, 96, 3693, 15005, 18978, 18978, 18978, 43002, 55943, 972190, 1151214, 2799146, 15519397, 15519397, 15519397, 122101417, 210553237, 289585489, 473093534
OFFSET
0,2
COMMENTS
The requirement a(n) > 0 is somewhat arbitrary, chosen for agreement with A046641; a(n) >= 0 would have been possible, too, yielding a(0)=0.
a(29) > 10^9.
FORMULA
a(n) = A046641(2^n).
PROG
(sh) i=1; c=1; while [ $c -le 21 ]; do echo -n `./A046641 $i`", "; c=`expr $c + 1`; i=`expr $i + $i`; done # M. F. Hasler, Oct 18 2008
CROSSREFS
KEYWORD
more,nonn
AUTHOR
M. F. Hasler, Oct 12 2008
EXTENSIONS
More terms from M. F. Hasler, Oct 18 2008
a(22)-a(28) from Max Alekseyev, Dec 16 2011
STATUS
approved