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Largest prime < 10*a(n-1), a(1)=31.
2

%I #11 Dec 15 2024 15:46:24

%S 31,307,3067,30661,306589,3065863,30658619,306586169,3065861681,

%T 30658616789,306586167863,3065861678629,30658616786249,

%U 306586167862427,3065861678624219,30658616786242157,306586167862421549,3065861678624215469,30658616786242154603,306586167862421546017

%N Largest prime < 10*a(n-1), a(1)=31.

%H Vincenzo Librandi, <a href="/A124335/b124335.txt">Table of n, a(n) for n = 1..200</a>

%t NestList[NextPrime[10 #, -1]&, 31, 30] (* _Vincenzo Librandi_, Jun 28 2014 *)

%Y Cf. A124262.

%K nonn

%O 1,1

%A _Artur Jasinski_, Dec 16 2006