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A222231 In the number n, replace all (decimal) digits '2' with '7' and vice versa. 1
0, 1, 7, 3, 4, 5, 6, 2, 8, 9, 10, 11, 17, 13, 14, 15, 16, 12, 18, 19, 70, 71, 77, 73, 74, 75, 76, 72, 78, 79, 30, 31, 37, 33, 34, 35, 36, 32, 38, 39, 40, 41, 47, 43, 44, 45, 46, 42, 48, 49, 50, 51, 57, 53, 54, 55, 56, 52, 58, 59, 60, 61, 67, 63, 64, 65, 66, 62, 68, 69, 20, 21, 27, 23 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

The map which is applied to primes in A171036.

LINKS

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

MATHEMATICA

a[n_]:= IntegerDigits[n]/.{2->7, 7->2} // FromDigits; Table[a[n], {n, 0, 80}] (* Vincenzo Librandi, Jul 30 2013 *)

PROG

(PARI) A222231(n, d=[0, 1, 7, 3, 4, 5, 6, 2, 8, 9])=sum(i=1, #n=digits(n), d[n[i]+1]*10^(#n-i)) \\ gives correct value for n=0 iff d[1]=0, since digits(0)=[] in PARI (v.2.6)

CROSSREFS

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

Sequence in context: A013664 A154173 A075697 * A011252 A165331 A225442

Adjacent sequences:  A222228 A222229 A222230 * A222232 A222233 A222234

KEYWORD

nonn,base,easy

AUTHOR

M. F. Hasler, Feb 12 2013

STATUS

approved

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Last modified October 17 15:01 EDT 2019. Contains 328116 sequences. (Running on oeis4.)