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 A009993 Numbers whose decimal digits are in strictly increasing order. 15
 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. - Reinhard Zumkeller, Jun 30 2010 Number of terms in [10^(n-1), 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 *) PROG (PARI) is_A009993(n)=Set(n=digits(n))==n \\ M. F. Hasler, Dec 11 2019 (PARI) forsubset(9, s, print1(fromdigits(Vec(s))", ")) \\ M. F. Hasler, Dec 11 2019 CROSSREFS Cf. A009995. Sequence in context: A032881 A239216 A032848 * A190218 A055569 A351119 Adjacent sequences:  A009990 A009991 A009992 * A009994 A009995 A009996 KEYWORD nonn,fini,full,base AUTHOR STATUS approved

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Last modified July 2 21:48 EDT 2022. Contains 355029 sequences. (Running on oeis4.)