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A222253
In the number n, replace all (decimal) digits '7' with '9' and vice versa.
1
0, 1, 2, 3, 4, 5, 6, 9, 8, 7, 10, 11, 12, 13, 14, 15, 16, 19, 18, 17, 20, 21, 22, 23, 24, 25, 26, 29, 28, 27, 30, 31, 32, 33, 34, 35, 36, 39, 38, 37, 40, 41, 42, 43, 44, 45, 46, 49, 48, 47, 50, 51, 52, 53, 54, 55, 56, 59, 58, 57, 60, 61, 62, 63, 64, 65, 66, 69, 68, 67, 90, 91, 92, 93, 94, 95
OFFSET
0,3
COMMENTS
The map which is applied to primes in A171056.
LINKS
MATHEMATICA
a[n_]:= IntegerDigits[n]/.{7->9, 9->7}//FromDigits; Table[a[n], {n, 0, 80}] (* Vincenzo Librandi, Jul 29 2013 *)
PROG
(PARI) A222253(n, d=[0, 1, 2, 3, 4, 5, 6, 9, 8, 7])=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