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A009993 List of numbers whose decimal digits are in strictly increasing order. 13
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 15, 16, 17, 18, 19, 23, 24, 25, 26, 27, 28, 29, 34, 35, 36, 37, 38, 39, 45, 46, 47, 48, 49, 56, 57, 58, 59, 67, 68, 69, 78, 79, 89, 123, 124, 125, 126, 127, 128, 129, 134, 135, 136, 137, 138, 139, 145, 146, 147, 148, 149, 156, 157 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Sequence has 512 terms, since every term except 0 corresponds to a nonempty subset of {1,2,3,4,5,6,7,8,9}.

A178788(a(n)) = 1. [From Reinhard Zumkeller, Jun 30 2010]

Number of terms between [10^(n-1) and 10^n): 0, 9, 36, 84, 126, 126, 84, 36, 9, 1. - Robert G. Wilson v, Jul 20 2014

LINKS

Zak Seidov, Table of n, a(n) for n = 1..512 (full sequence)

Eric Weisstein's World of Mathematics, Digit

MATHEMATICA

Flatten@Table[FromDigits/@Subsets[Range[1, 9], {n}], {n, 0, 9}] (* Zak Seidov, May 19 2006 *)

CROSSREFS

Cf. A009995.

Sequence in context: A032881 A239216 A032848 * A190218 A055569 A277046

Adjacent sequences:  A009990 A009991 A009992 * A009994 A009995 A009996

KEYWORD

nonn,fini,full,base

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 19 22:00 EDT 2018. Contains 316378 sequences. (Running on oeis4.)