BBC Russian

A222253

In the number n, replace all (decimal) digits '7' with '9' and vice versa.

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

COMMENTS

The map which is applied to primes in A171056.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

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)

CROSSREFS