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 A160681 Primes of form 10 * 2^(2^n) + 19. 0
 59, 179, 2579, 655379, 42949672979, 184467440737095516179, 3402823669209384634633746074317682114579 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Primes of the form 10*A000215(n) + 9. - Arkadiusz Wesolowski, Mar 04 2011 a(n) is composite for n = 0 and all 8 <= n <= 26. - Arkadiusz Wesolowski, Oct 21 2013 LINKS G. L. Honaker, Jr. and Chris Caldwell, Prime Curios! 9 MATHEMATICA Select[Table[10*2^2^n + 19, {n, 0, 7}], PrimeQ] (* Arkadiusz Wesolowski, Mar 04 2011 *) PROG (MAGMA) [10*2^2^n+19 : n in [0..7] | IsPrime(10*2^2^n+19)]; // Arkadiusz Wesolowski, Mar 04 2011 (PARI) for(n=0, 7, if(isprime(x=(10*2^2^n+19)), print1(x, ", "))); \\ Arkadiusz Wesolowski, Mar 04 2011 CROSSREFS Cf. A030433, A000215. Sequence in context: A142799 A250025 A140626 * A142857 A142064 A114353 Adjacent sequences:  A160678 A160679 A160680 * A160682 A160683 A160684 KEYWORD nonn,hard AUTHOR Arkadiusz Wesolowski, May 23 2009 STATUS approved

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Last modified June 17 19:02 EDT 2019. Contains 324198 sequences. (Running on oeis4.)