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A222246 In the number n, replace all (decimal) digits '5' with '7' and vice versa. 1

%I #10 Mar 30 2017 22:41:40

%S 0,1,2,3,4,7,6,5,8,9,10,11,12,13,14,17,16,15,18,19,20,21,22,23,24,27,

%T 26,25,28,29,30,31,32,33,34,37,36,35,38,39,40,41,42,43,44,47,46,45,48,

%U 49,70,71,72,73,74,77,76,75,78,79,60,61,62,63,64,67,66,65,68,69,50,51,52,53,54,57

%N In the number n, replace all (decimal) digits '5' with '7' and vice versa.

%C The map which is applied to primes in A171039.

%H Vincenzo Librandi, <a href="/A222246/b222246.txt">Table of n, a(n) for n = 0..1000</a>

%t a[n_]:= IntegerDigits[n]/.{5->7, 7->5} // FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 31 2013 *)

%o (PARI) A222246(n,d=[0, 1, 2, 3, 4, 7, 6, 5, 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 0,3

%A _M. F. Hasler_, Feb 13 2013

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