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%I #2 Mar 30 2012 17:22:43
%S 7,89,983,9931,99991,999331,9997879,99999551,999998693,9999995363,
%T 99999976319,999999998533,9999999954787
%N Greatest cluster prime less than 10^n.
%C These numbers are useful for generating intermediate cluster primes because the best algorithm for generating cluster primes requires starting with a known cluster prime.
%Y Cf. A038134 (cluster primes), A039506 (number of cluster primes < 10^n), A121045.
%K nonn
%O 1,1
%A _T. D. Noe_, Jul 21 2006