Search: id:A095714
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%I A095714
%S A095714 3,5,7,33,45,105,197,199,281,301,317,1107,1657,3395,35925,37597
%N A095714 Numbers n such that 90*R_n + 1 is prime, where R_n = 11...1 is the repunit 
               (A002275) of length n.
%C A095714 Also numbers n such that 10^n - 9 is a prime.
%C A095714 No more terms below 4300. Robert G. Wilson v Oct 15 2004.
%H A095714 <a href="Sindx_Pri.html#Pri_rep">Index entries for primes involving repunits</
               a>
%e A095714 a(2) = 5, since 10^5 - 9 = 99991, which is prime
%t A095714 Do[ If[ PrimeQ[10^n - 9], Print[n]], {n, 0, 7000}]
%Y A095714 Cf. A088275.
%Y A095714 Sequence in context: A162714 A002396 A029508 this_sequence A137864 A069969 
               A067232
%Y A095714 Adjacent sequences: A095711 A095712 A095713 this_sequence A095715 A095716 
               A095717
%K A095714 nonn
%O A095714 1,1
%A A095714 Alonso Delarte (alonso.delarte(AT)gmail.com), Jul 07 2004
%E A095714 More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 15 2004
%E A095714 2 more terms from Jason Earls (zevi_35711(AT)yahoo.com), Jan 07 2008

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