OFFSET
0,3
COMMENTS
The map which is applied to primes in A171053.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
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)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
M. F. Hasler, Feb 13 2013
STATUS
approved