van Halewyn, Three new factors of Fermat numbers, Math. Comput., 69(2000) 1297–1304; MR 2000j: 11194. Google Scholar R. P. Brent and J. M. Pollard, Factorization of the eighth Fermat number, Math. Comput., 36(1981) 627–630; MR 83h:10014. Google Scholar John Brillhart and ...
Is 1120 a prime number? No. As soon as you see that '0' at the end, you know it's a multiple of '10'.No multiple of '10' can be a prime, because in addition to itself and '1', it alsohas '2' and '5' for factors.In addition to '2' and '5', this particular number ...