

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
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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^(n1) 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



