Calculate Additions of Non Repeating Triangular numbers:

tn.py

tn=1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 0, 0
soln={}

for i in tn[:]:
    for j in tn[tn.index(i)+1:]:
        for k in tn[tn.index(j)+1:]:
            for l in tn[tn.index(k)+1:]:
                print i,j,k,l
                soln[i+j+k+l]=i,j,k,l

print soln

print "I can't form the following integars below 100: "

for i in range(100):
   if i not in soln:
        print i