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A222216 In the number n, replace all (decimal) digits 0 with 7 and vice versa.

%I A222216 #14 Mar 31 2017 00:30:02
%S A222216 7,1,2,3,4,5,6,0,8,9,17,11,12,13,14,15,16,10,18,19,27,21,22,23,24,25,
%T A222216 26,20,28,29,37,31,32,33,34,35,36,30,38,39,47,41,42,43,44,45,46,40,48,
%U A222216 49,57,51,52,53,54,55,56,50,58,59,67,61,62,63,64,65,66,60,68,69,7,1,2,3,4,5
%N A222216 In the number n, replace all (decimal) digits 0 with 7 and vice versa.
%C A222216 The map which is applied to primes in A171034.
%H A222216 Vincenzo Librandi, <a href="/A222216/b222216.txt">Table of n, a(n) for n = 0..1000</a>
%p A222216 A222216 := proc(n)
%p A222216     if n = 0 then
%p A222216         7;
%p A222216     else
%p A222216         dgs := convert(n,base,10) ;
%p A222216         dgs := [seq( subs({0=7,7=0},op(d,dgs)),d=1..nops(dgs))] ;
%p A222216         add(op(d,dgs)*10^(d-1),d=1..nops(dgs)) ;
%p A222216     end if;
%p A222216 end proc: # _R. J. Mathar_, Feb 15 2013
%t A222216 a[n_]:= IntegerDigits[n]/.{0->7, 7->0} // FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 29 2013 *)
%o A222216 (PARI) A222216(n,d=[7,1,2,3,4,5,6,0,8,9])={sum(i=1,#n=digits(n),d[n[i]+1]*10^(#n-i),!n*d[1])} \\ N.B.: digits(0)=[] in PARI (v.2.6)
%Y A222216 Cf. A222210-A222254; A171013-A171016, A175770, A171018-A171057.
%K A222216 nonn,base,easy
%O A222216 0,1
%A A222216 _M. F. Hasler_, Feb 12 2013