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A145523 Least integer k > 0 such that A000041(k) is divisible by 2^n. 2

%I

%S 1,2,11,11,15,66,66,96,96,96,96,96,3693,15005,18978,18978,18978,43002,

%T 55943,972190,1151214,2799146,15519397,15519397,15519397,122101417,

%U 210553237,289585489,473093534

%N Least integer k > 0 such that A000041(k) is divisible by 2^n.

%C 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.

%C a(29) > 10^9.

%F a(n) = A046641(2^n).

%o (*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

%Y Cf. A000041, A046641, A000123, A046063.

%K more,nonn

%O 0,2

%A _M. F. Hasler_, Oct 12 2008

%E More terms from _M. F. Hasler_, Oct 18 2008

%E a(22)-a(28) from _Max Alekseyev_, Dec 16 2011

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Last modified June 16 11:58 EDT 2021. Contains 345057 sequences. (Running on oeis4.)