%N Numbers n such that n!!!!+1 is prime.
%C The search for multifactorial primes started by Ray Ballinger is now continued by a team of volunteers on the website of Ken Davis (see link).
%H Ken Davis, <a href="http://mfprimes.free-dc.org">Status of Search for Multifactorial Primes.</a>
%H Ken Davis, <a href="http://mfprimes.free-dc.org/mfdata/f04p.html">Results for n!4+1.</a>
%Y Cf. A007662 (quadruple factorials), A085147.
%A _Hugo Pfoertner_, Jun 25 2003
%E More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008