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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 STATUS approved

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Last modified October 21 06:01 EDT 2019. Contains 328291 sequences. (Running on oeis4.)