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%I #11 Mar 31 2017 00:44:18
%S 2,3,5,9,11,13,19,17,23,27,31,39,41,43,49,53,57,61,69,91,93,97,83,87,
%T 79,101,103,109,107,113,129,131,139,137,147,151,159,163,169,193,197,
%U 181,171,173,179,177,211,223,229,227,233,237,241,251,259,263
%N In the sequence of prime numbers, replace all the '9' digits with '7' and vice versa.
%H Vincenzo Librandi, <a href="/A171056/b171056.txt">Table of n, a(n) for n = 1..1000</a>
%t FromDigits[IntegerDigits[#] /. {9 -> p, 7 -> q} /. {p -> 7, q -> 9}] & /@ Prime[Range[100]] (* _Vincenzo Librandi_, Apr 07 2013 *)
%o (PARI) a(n)=my(v=[0,1,2,3,4,5,6,9,8,7]);subst(Pol(apply(k->v[k+1], digits(prime(n)))),'x,10) \\ _Charles R Greathouse IV_, Jul 31 2013
%K nonn,base,easy
%O 1,1
%A _N. J. A. Sloane_ and _Vincenzo Librandi_, Sep 04 2010
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