login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A222242 In the number n, replace all (decimal) digits '4' with '7' and vice versa. 1
0, 1, 2, 3, 7, 5, 6, 4, 8, 9, 10, 11, 12, 13, 17, 15, 16, 14, 18, 19, 20, 21, 22, 23, 27, 25, 26, 24, 28, 29, 30, 31, 32, 33, 37, 35, 36, 34, 38, 39, 70, 71, 72, 73, 77, 75, 76, 74, 78, 79, 50, 51, 52, 53, 57, 55, 56, 54, 58, 59, 60, 61, 62, 63, 67, 65, 66, 64, 68, 69, 40, 41, 42, 43, 47, 45 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

The map which is applied to primes in A171038.

LINKS

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

MATHEMATICA

Table[FromDigits[IntegerDigits[n]/.{4->a, 7->b}/.{a->7, b->4}], {n, 0, 80}] (* Harvey P. Dale, Jul 22 2013 *)

PROG

(PARI) A222242(n, d=[0, 1, 2, 3, 7, 5, 6, 4, 8, 9])={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

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

Sequence in context: A060940 A318739 A205299 * A069771 A235801 A076986

Adjacent sequences:  A222239 A222240 A222241 * A222243 A222244 A222245

KEYWORD

nonn,base,easy

AUTHOR

M. F. Hasler, Feb 13 2013

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 21 20:25 EDT 2019. Contains 321382 sequences. (Running on oeis4.)