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%I A204578 #9 Oct 18 2021 13:21:36
%S A204578 3,23,6103515623,1490116119384765623,
%T A204578 88817841970012523233890533447265623,
%U A204578 11754943508222875079687365372222456778186655567720875215087517062784172594547271728515623,44841550858394146269559346665277316200968382140048504696226185084473314645947539247572422027587890623
%N A204578 Primes of the form 5^k-2.
%C A204578 See the sequence A109080 for the corresponding exponents k.
%C A204578 The number a(3) = 6103515623 is also in A095304, A104090 and A128472.
%F A204578 a(n) = 5^A109080(n)-2.
%o A204578 (PARI)  for(i=0,999, ispseudoprime(t=5^i-2) & print1(t","))
%Y A204578 Cf. A109080.
%K A204578 nonn,less
%O A204578 1,1
%A A204578 _M. F. Hasler_, Jan 30 2012

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