I am working to eliminate 21181 from the list of possible Sierpinski number?I m finding the converging set of factors for this number if it exist? Up to n=100 except n=28 , I can prove that 21181*2^n is a composite number. But I don't have any medium which can calculate the factor of that number?so please help me to know factors of number 21181*2^28+1.
Thank you so much