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%I #7 Dec 15 2017 17:36:47
%S 11,36,53,54,109,123,259,380,877,1205,1795,14153,21965
%N Numbers n such that 22446688 * 10^n + 1 is prime.
%C These are almost-all-even-digits primes and they have all been certified. No more terms up to 25000. Primality proof for the largest: PFGW Version 20041001.Win_Stable (v1.2 RC1b) [FFT v23.8] Primality testing 22446688*10^21965+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 22446688*10^21965+1 is prime! (70.7023s+0.0215s)
%H R. Ondrejka, <a href="http://www.utm.edu/research/primes/lists/top_ten/">The Top Ten: a Catalogue of Primal Configurations</a>.
%o (PARI) is(n)=ispseudoprime(22446688*10^n+1) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y Cf. A068690.
%K nonn
%O 1,1
%A _Jason Earls_, May 19 2005
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