Untitled

from Tkinter import *

global e

def calc():
	i = int(str(e.get()))
	print 'Given %d:\n >' % (i),
	n = 0
	for y in range(i):
		print '%d,' % (3+n),
		n += 2
	print ''

window = Tk()
lbl = Label(window, text='How many iterations?')
lbl.pack(side=TOP)
e = Entry(name='text')
e.pack(expand = YES, fill = BOTH)
b = Button(window, text='Calculate', command=calc)
b.pack(side=BOTTOM)
window.mainloop()