A222249 - OEIS

%I #10 Mar 30 2017 22:40:20

%S 0,1,2,3,4,5,7,6,8,9,10,11,12,13,14,15,17,16,18,19,20,21,22,23,24,25,

%T 27,26,28,29,30,31,32,33,34,35,37,36,38,39,40,41,42,43,44,45,47,46,48,

%U 49,50,51,52,53,54,55,57,56,58,59,70,71,72,73,74,75,77,76,78,79,60,61,62,63,64,65

%N In the number n, replace all (decimal) digits '6' with '7' and vice versa.

%C The map which is applied to primes in A171040.

%H Vincenzo Librandi, <a href="/A222249/b222249.txt">Table of n, a(n) for n = 0..1000</a>

%t a[n_]:= IntegerDigits[n]/.{6->7, 7->6} // FromDigits; Table[a[n], {n, 0, 80}] (* _Vincenzo Librandi_, Jul 31 2013 *)

%o (PARI) A222249(n,d=[0, 1, 2, 3, 4, 5, 7, 6, 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