From: Jason Lillywhite [mailto:jason.lillywhite / gmail.com] 
# I am building a hash this way:
# h = {}
# i = 0
# j = 24
# while i < 15 do
#   h[i] = j
#   i += 1
#   j += 6
# end
# => {5=>54, 11=>90, 0=>24, 6=>60, 12=>96, 1=>30, 7=>66,
# 13=>102, 2=>36, 8=>72, 14=>108, 3=>42, 9=>78, 4=>48, 10=>84}
# Just what I need, but doesn't seem very Ruby-friendly
# And if I want to change each hash value from fixnum to 
# string, how would that be done?
# this is not working:  new_hash = h.each_key {|k| h[k].to_s}

you're indexing normally, why not use an array?

> ar=Array.new(15){|x| 24+x*6}
=> [24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84, 90, 96, 102, 108]
> ar[0]
=> 24
> ar[5]
=> 54

w added adv that you can refer in groups

> ar[0..5]
=> [24, 30, 36, 42, 48, 54]

no need to rush,  you can convert to hash anytime ;)

> hh=Hash[*ar.each_with_index.to_a.flatten]
=> {60=>6, 66=>7, 72=>8, 78=>9, 84=>10, 90=>11, 24=>0, 96=>12, 30=>1, 102=>13, 36=>2, 108=>14, 42=>3, 48=>4, 54=>5}