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%I #9 Mar 31 2017 11:10:39
%S 2,3,5,1,77,73,71,79,23,29,37,31,47,43,41,53,59,67,61,17,13,19,83,89,
%T 91,707,703,701,709,773,721,737,731,739,749,757,751,763,761,713,719,
%U 787,797,793,791,799,277,223,221,229,233,239,247,257,251,263
%N In the sequence of prime numbers, replace all the '7' digits with '1' and vice versa.
%H Vincenzo Librandi, <a href="/A171035/b171035.txt">Table of n, a(n) for n = 1..1000</a>
%t FromDigits[IntegerDigits[#]/.{7->p, 1->q}/.{p->1, q->7}]&/@Prime[Range[100]] (* _Vincenzo Librandi_, Apr 07 2013 *)
%o (PARI) a(n)=my(v=[0,7,2,3,4,5,6,1,8,9]);subst(Pol(apply(k->v[k+1], digits(prime(n)))),'x,10) \\ _Charles R Greathouse IV_, Jul 25 2013
%K nonn,base,easy
%O 1,1
%A _N. J. A. Sloane_ and _Vincenzo Librandi_, Sep 04 2010
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