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%I #12 Mar 31 2017 00:52:37
%S 2,3,5,7,11,13,17,19,23,29,31,37,81,83,87,53,59,61,67,71,73,79,43,49,
%T 97,101,103,107,109,113,127,131,137,139,189,151,157,163,167,173,179,
%U 141,191,193,197,199,211,223,227,229,233,239,281,251,257,263
%N In the sequence of prime numbers, replace all the '8' digits with '4' and vice versa.
%H Vincenzo Librandi, <a href="/A171045/b171045.txt">Table of n, a(n) for n = 1..1000</a>
%t FromDigits[IntegerDigits[#] /. {8 -> p, 4 -> q} /. {p -> 4, q -> 8}] & /@ Prime[Range[100]] (* _Harvey P. Dale_, Jun 10 2011 *)
%o (PARI) a(n)=my(v=[0,1,2,3,8,5,6,7,4,9]);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