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A256341 Numbers which have only digits 8 and 9 in base 10. 9
8, 9, 88, 89, 98, 99, 888, 889, 898, 899, 988, 989, 998, 999, 8888, 8889, 8898, 8899, 8988, 8989, 8998, 8999, 9888, 9889, 9898, 9899, 9988, 9989, 9998, 9999, 88888, 88889, 88898, 88899, 88988, 88989, 88998, 88999, 89888, 89889 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..8190

Index entries for 10-automatic sequences.

FORMULA

a(n) = A007931(n) + A002281(A000523(n+1)) = A256341(n) + A256077(n) etc.

MATHEMATICA

Flatten[Table[FromDigits[#, 10]&/@Tuples[{8, 9}, n], {n, 5}]]

PROG

(MAGMA) [n: n in [1..35000] | Set(IntegerToSequence(n, 10)) subset {8, 9}];

(PARI) A256341(n)=vector(#n=binary(n+1)[2..-1], i, 10^(#n-i))*n~+10^#n\9*8

(MAGMA) [n: n in [1..100000] | Set(Intseq(n)) subset {8, 9}]; // Vincenzo Librandi, Aug 19 2016

CROSSREFS

Cf. A007088 (digits 0 & 1), A007931 (digits 1 & 2), A032810 (digits 2 & 3), A032834 (digits 3 & 4), A256290 (digits 4 & 5) - A256292 (digits 6 & 7), A256340 (digits 7 & 8).

Sequence in context: A195991 A304410 A248290 * A116249 A256162 A175556

Adjacent sequences:  A256338 A256339 A256340 * A256342 A256343 A256344

KEYWORD

nonn,base,easy

AUTHOR

M. F. Hasler, Mar 27 2015

STATUS

approved

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Last modified April 20 04:42 EDT 2019. Contains 322294 sequences. (Running on oeis4.)