Hi, I need your help

I need to design an excel macro to first locate specific forword and
reverse PCR primer sequences within download sequences, the search for
various 4-base cutter restriction enzyme recognition sequences. Primer
matching is accomplished using an algorithm:HP= (2(A+T)+3(G+C))/L

where A+T is the number of the adenine-thymine pairs in the hybtrid
G+C is the number of guanine-cytosine pairs
L the lengh of the probe

and choosing a position where the HP is 1.8


can you help me?

thank youuuuuuuuuuuuuuuuuuuuuuuuuuu
Anna Maria