# Pull out the common denominator of fractions

I have this code:

K[Q_, n_Integer] :=
Module[{z, x},
SymmetricReduction[
SeriesCoefficient[
Product[ComposeSeries[Series[Q[z], {z, 0, n}],
Series[x[i] z, {z, 0, n}]], {i, 1, n}], n],
Table[x[i], {i, 1, n}], Table[Subscript[c, i], {i, 1, n}]][]]

poly = K[Sqrt[#]/Tanh[Sqrt[#]] &, 4] /. c -> p;
primeFactorForm[n_] :=
If[Length@# == 1, First@#, CenterDot @@ #] &[
Superscript @@@ FactorInteger[n]];
gcd = GCD @@ List @@ poly /. Rational[n_, d_]*c_ :> d;

For[i = 0, i < 8, i++,
poly = K[Sqrt[#]/Tanh[Sqrt[#]] &, i] /. c -> p;
Print[Subscript[L, i], " = ",
1/primeFactorForm[gcd]* Plus @@ List @@ Distribute[gcd*poly] /.
Times[Rational[n_, d_], e__] :>
primeFactorForm[n]/ primeFactorForm[d]*e]] // Expand


It outputs polynomials in different variables, factorizing everything and calculating the common denominator so it can be pulled out. I have some problems with formatting (I need this for a paper so it should look good). When the polynomial has many terms, the common denominator is out to the left and the rest is in a round bracket to the right (something like $\frac{1}{23}(2p_1+\frac{5p_2}{2})$, but with many more terms). But when there are just a few terms in the polynomial the output looks like this: $\frac{2p_1+\frac{5p_2}{2}}{23}$, which is quite ugly for a paper. Can someone tell me how to enforce it to use brackets all the time? Thank you!

• You should provide enough code and data to produce a minimal working example. Have you tried using Simplify or Factor? – Bob Hanlon Mar 10 '18 at 14:55
• @BobHanlon I added a working example. I tried using these, but maybe I didn't added them in the right place... – Silviu Mar 10 '18 at 17:19
• Perhaps, For[i = 0, i < 8, i++, poly = K[Sqrt[#]/Tanh[Sqrt[#]] &, i] /. c -> p; Print[Subscript[L, i], " = ", ((1/gcd*Plus @@ List @@ Distribute[gcd*poly]) // Together) /. Times[Rational[n_, d_], e__] :> n/primeFactorForm[d]*e]] – Bob Hanlon Mar 10 '18 at 20:30

         For[i = 0, i < 8, i++, poly = K[Sqrt[#]/Tanh[Sqrt[#]] &, i] /. c -> 