Smallest prime of the form 4*k + 3 that is a divisor of 4*n! - 1.

Terms

a(0) =3a(1) =3a(2) =7a(3) =23a(4) =19a(5) =479a(6) =2879a(7) =19a(8) =179a(9) =2551a(10) =14515199a(11) =159667199a(12) =26246663a(13) =47a(14) =3007159a(15) =85303a(16) =43a(17) =455999a(18) =13099a(19) =311369011223a(21) =59a(22) =50207a(24) =71a(25) =61651424911a(27) =3902575987