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%I #6 Jan 02 2019 03:02:39
%S 7,17,37,47,67,71,73,107,127,137,157,167,173,227,257,271,277,307,317,
%T 337,347,367,373,457,467,547,557,571,577,607,617,647,673,677,701,727,
%U 733,743,751,757,761,773,1117,1171,1217,1237,1277,1307,1327,1367
%N Primes with maximal digit = 7.
%H Robert Israel, <a href="/A106095/b106095.txt">Table of n, a(n) for n = 1..10000</a>
%p Res:= 7:
%p A:= {7}: B:= {$1..6}:
%p for d from 2 to 4 do
%p A:= {seq(seq(10*a+i,i=0..7),a=A), seq(10*b+7,b=B)}:
%p B:= {seq(seq(10*b+i,i=0..6),b=B)}:
%p Res:= Res, op(sort(convert(select(isprime,A),list)))
%p od:
%p Res; # _Robert Israel_, Jan 01 2019
%t Select[Prime[Range[200]], Max[IntegerDigits[ # ]]==7&]
%K nonn,base
%O 1,1
%A _Zak Seidov_, May 07 2005