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A222244
In the number n, replace all (decimal) digits '4' with '9' and vice versa.
1
0, 1, 2, 3, 9, 5, 6, 7, 8, 4, 10, 11, 12, 13, 19, 15, 16, 17, 18, 14, 20, 21, 22, 23, 29, 25, 26, 27, 28, 24, 30, 31, 32, 33, 39, 35, 36, 37, 38, 34, 90, 91, 92, 93, 99, 95, 96, 97, 98, 94, 50, 51, 52, 53, 59, 55, 56, 57, 58, 54, 60, 61, 62, 63, 69, 65, 66, 67, 68, 64, 70, 71, 72, 73, 79, 75
OFFSET
0,3
COMMENTS
The map which is applied to primes in A171053.
LINKS
MATHEMATICA
a[n_]:= IntegerDigits[n]/.{4->9, 9->4} // FromDigits; Table[a[n], {n, 0, 80}] (* Vincenzo Librandi, Jul 31 2013 *)
PROG
(PARI) A222244(n, d=[0, 1, 2, 3, 9, 5, 6, 7, 8, 4])={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)
KEYWORD
nonn,base,easy
AUTHOR
M. F. Hasler, Feb 13 2013
STATUS
approved