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In the number n, replace all (decimal) digits '5' with '9' and vice versa.
1

%I #10 Mar 30 2017 22:40:51

%S 0,1,2,3,4,9,6,7,8,5,10,11,12,13,14,19,16,17,18,15,20,21,22,23,24,29,

%T 26,27,28,25,30,31,32,33,34,39,36,37,38,35,40,41,42,43,44,49,46,47,48,

%U 45,90,91,92,93,94,99,96,97,98,95,60,61,62,63,64,69,66,67,68,65,70,71,72,73,74,79

%N In the number n, replace all (decimal) digits '5' with '9' and vice versa.

%C The map which is applied to primes in A171054.

%H Vincenzo Librandi, <a href="/A222248/b222248.txt">Table of n, a(n) for n = 0..1000</a>

%t a[n_]:= IntegerDigits[n]/.{5->9, 9->5} // FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 31 2013 *)

%o (PARI) A222248(n,d=[0, 1, 2, 3, 4, 9, 6, 7, 8, 5])=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 0,3

%A _M. F. Hasler_, Feb 13 2013