#! /bin/sh
#
# Takes a list of natural numbers on stdin; outputs the hex
#  representation of the OR of 1<<N for each of these numbers N.
#
# The input may use any non-digit character as separator.
#
(
	echo ?e+511
	(	echo 'cvt(0';
		(tr -cs 0-9 \\n; echo '') |
		  sort -nu |
		  sed -e '/^$/d' -e 's/.*/+pow(2,&)/'
		echo ',16)'
	) | tr -d \\n
	echo ""
) | calc -q | sed -n -e '/^#x/s///p'