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Numbers k such that 9*10^k - 11 is prime.
3

%I #18 Sep 11 2024 21:59:30

%S 1,4,16,22,316,393,461,864,1306,2964,8956,10449,11652,13588,23070,

%T 48421

%N Numbers k such that 9*10^k - 11 is prime.

%C Numbers corresponding to terms <= 864 are certified primes. - _Klaus Brockhaus_, Feb 15 2005

%o (PARI) is(n)=ispseudoprime(9*10^n-11) \\ _Charles R Greathouse IV_, May 22 2017

%Y Cf. A092767.

%K nonn,more

%O 1,2

%A _R. K. Guy_, Dec 29 2004

%E More terms from _Patrick De Geest_, Dec 29 2004

%E a(1) = 1 inserted by _Tom Mueller_, Feb 08 2005

%E Edited by _R. J. Mathar_, Aug 06 2008

%E a(14)-a(15) from _Michael S. Branicky_, May 01 2023

%E a(16) from _Michael S. Branicky_, Sep 11 2024