A104088 Largest prime <= 3^n.
3, 7, 23, 79, 241, 727, 2179, 6553, 19681, 59029, 177131, 531383, 1594301, 4782961, 14348891, 43046623, 129140153, 387420479, 1162261453, 3486784393, 10460353199, 31381059607, 94143178807, 282429536453, 847288609423
Offset: 1
Programs
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Mathematica
PrimePrev[n_]:=Module[{k=n},While[ !PrimeQ[k],k-- ];k];f[n_]:=3^n;lst={};Do[AppendTo[lst,PrimePrev[f[n]]],{n,5!}];lst (* Vladimir Joseph Stephan Orlovsky, Feb 26 2010 *) Join[{3},NextPrime[3^Range[2,50],-1]] (* Harvey P. Dale, Jun 20 2021 *) -
PARI
g(n,b) = for(x=0,n,print1(precprime(b^x)","))