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A136333 Numbers containing only digits coprime to 10 in their decimal representation. 8
1, 3, 7, 9, 11, 13, 17, 19, 31, 33, 37, 39, 71, 73, 77, 79, 91, 93, 97, 99, 111, 113, 117, 119, 131, 133, 137, 139, 171, 173, 177, 179, 191, 193, 197, 199, 311, 313, 317, 319, 331, 333, 337, 339, 371, 373, 377, 379, 391, 393, 397, 399, 711, 713, 717, 719, 731 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Numbers containing digits 1,3,7,9 only, or, numbers written in base 4 (cf. A007090) with digits mapped by: 0->1, 1->3, 2->7 and 3->9. - Reinhard Zumkeller, Jul 17 2014

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Index entries for 10-automatic sequences.

MATHEMATICA

fQ[n_] := Block[{s = {1, 3, 7, 9}}, Union[Join[s, IntegerDigits@ n]] == s]; Select[ Range@ 1000, fQ] (* or *)

depth = 3; FromDigits@# & /@ FlattenAt[ Table[ Tuples[{1, 3, 7, 9}, n], {n, depth}], {#} & /@ Range[depth]] (* Robert G. Wilson v, Jul 02 2014 *)

PROG

(Haskell)

import Data.List (intersect)

a136333 n = a136333_list !! (n-1)

a136333_list = filter (null . intersect "024568" . show) [1..]

-- Reinhard Zumkeller, Jul 17 2014

CROSSREFS

Cf. A091633 (primes), A245193.

Sequence in context: A080903 A172253 A104381 * A134454 A324695 A113522

Adjacent sequences:  A136330 A136331 A136332 * A136334 A136335 A136336

KEYWORD

nonn,base,easy

AUTHOR

Reinhard Zumkeller, Mar 26 2008

STATUS

approved

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Last modified September 20 10:10 EDT 2019. Contains 327229 sequences. (Running on oeis4.)