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%I #4 Jul 20 2015 03:52:08
%S 1,8,69,574,5520,52155,502179,4882568,47709672,468269438,4610668567,
%T 45510662200,450072137956,4457717637910
%N Number of 7's among the digits of all n-digit primes.
%Y Cf. A130817, A152272, A152273, A152274, A152275, A152276, A152277, A152278, A152280, A152281.
%K base,nonn
%O 1,2
%A _Jon E. Schoenfield_, Dec 01 2008
%E a(12)-a(14) from _Giovanni Resta_, Jul 20 2015
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