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

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.

Links

Table of n, a(n) for n=0..28.

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

Cf. A000041, A046641, A000123, A046063.

Sequence in context: A345392 A027828 A106371 * A168413 A265561 A265545

Adjacent sequences: A145520 A145521 A145522 * A145524 A145525 A145526

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