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In the number n, replace all (decimal) digits 0 with 7 and vice versa.
1

%I #14 Mar 31 2017 00:30:02

%S 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 26,20,28,29,37,31,32,33,34,35,36,30,38,39,47,41,42,43,44,45,46,40,48,

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

%C The map which is applied to primes in A171034.

%H Vincenzo Librandi, <a href="/A222216/b222216.txt">Table of n, a(n) for n = 0..1000</a>

%p A222216 := proc(n)

%p if n = 0 then

%p 7;

%p else

%p dgs := convert(n,base,10) ;

%p dgs := [seq( subs({0=7,7=0},op(d,dgs)),d=1..nops(dgs))] ;

%p add(op(d,dgs)*10^(d-1),d=1..nops(dgs)) ;

%p end if;

%p end proc: # _R. J. Mathar_, Feb 15 2013

%t a[n_]:= IntegerDigits[n]/.{0->7, 7->0} // FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 29 2013 *)

%o (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 Cf. A222210-A222254; A171013-A171016, A175770, A171018-A171057.

%K nonn,base,easy

%O 0,1

%A _M. F. Hasler_, Feb 12 2013