Task 1: "Self-descriptive Numbers

Write a script to display the first three self-descriptive numbers. As per wikipedia, the definition of Self-descriptive Number is

    In mathematics, a self-descriptive number is an integer m that in a
    given base b is b digits long in which each digit d at position n (the
    most significant digit being at position 0 and the least significant
    at position b-1) counts how many instances of digit n are in m.

For example:

 1210 is a four-digit self-descriptive number:

    position 0 has value 1 i.e. there is only one 0 in the number
    position 1 has value 2 i.e. there are two 1 in the number
    position 2 has value 1 i.e. there is only one 2 in the number
    position 3 has value 0 i.e. there is no 3 in the number

Output

    1210, 2020, 21200

WARNING: I realised just before the launch this task was also part of the week
43 and contributed by Laurent Rosenfeld. It is too late to change now. Feel
free to share your previous solutions if you took part in the week 43
already. I should have been more carefull, sorry.
"

My notes: well, as it happened I skipped task 43, so let's have a go.  The
important thing is: number of digits == base, which puts extra constraints
on the digits.  So try bases b = 2.. try all base b numbers for "self-
descriptiveness" and then and stop after finding the first N self-descriptive
numbers.  Let's take N as a command line input for generality, default 3.


Task 2: "List Methods

Write a script to list methods of a package/class.

Example

package Calc;

use strict;
use warnings;

sub new { bless {}, shift; }
sub add { }
sub mul { }
sub div { }

1;

Output

BEGIN
mul
div
new
add
"

My notes: hmm, introspection.  I genuinely can't remember how to do this
without a but of googling.  Isn't there a symbol table hash per package,
that Memoize manipulates?  Ah yes: the stash containing typeglobs.