A222239 In the number n, replace all (decimal) digits '3' with '9' and vice versa.

0, 1, 2, 9, 4, 5, 6, 7, 8, 3, 10, 11, 12, 19, 14, 15, 16, 17, 18, 13, 20, 21, 22, 29, 24, 25, 26, 27, 28, 23, 90, 91, 92, 99, 94, 95, 96, 97, 98, 93, 40, 41, 42, 49, 44, 45, 46, 47, 48, 43, 50, 51, 52, 59, 54, 55, 56, 57, 58, 53, 60, 61, 62, 69, 64, 65, 66, 67, 68, 63, 70, 71, 72, 79, 74, 75

Offset: 0

Author

M. F. Hasler, Feb 13 2013

Keywords

• nonn
• base
• easy

Comments

The map which is applied to primes in A171052.

Links

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

Crossrefs

Cf. A222210-A222254; A171013-A171016, A175770, A171018-A171057.

Programs

Mathematica

a[n_]:= IntegerDigits[n]/.{3->9, 9->3} // FromDigits; Table[a[n], {n, 0, 80}] (* Vincenzo Librandi, Jul 30 2013 *)

PARI

A222239(n,d=[0, 1, 2, 9, 4, 5, 6, 7, 8, 3])=sum(i=1,#n=digits(n),d[n[i]+1]*10^(#n-i)) \\ gives correct result for n=0 iff d[1]=0, since digits(0)=[] in PARI (v.2.6)