login
Largest prime < n^4.
1

%I #6 Dec 08 2018 17:19:33

%S 13,79,251,619,1291,2399,4093,6553,9973,14639,20731,28559,38393,50599,

%T 65521,83497,104971,130307,159979,194479,234239,279823,331769,390581,

%U 456959,531383,614639,707279,809993,923513,1048573,1185907,1336333

%N Largest prime < n^4.

%t PrimePrev[n_]:=Module[{k},k=n-1;While[ !PrimeQ[k],k-- ];k];f[n_]:=n^4;lst={};Do[AppendTo[lst,PrimePrev[f[n]]],{n,5!}];lst

%t NextPrime[Range[2,40]^4,-1] (* _Harvey P. Dale_, May 05 2018 *)

%Y Cf. A014220, A053001, A077037

%K nonn

%O 2,1

%A _Vladimir Joseph Stephan Orlovsky_, Feb 25 2010