Primes of the form k!! + k - 1.A118744Primes of the form k!! + k - 1.Terms a(0) =3a(1) =5a(2) =11a(3) =19a(4) =53a(5) =953a(6) =46091a(7) =34459441a(8) =3715891219External referencesoeis: A118744