A072544 Numbers whose smallest decimal digit is also the initial digit.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 22, 23, 24, 25, 26, 27, 28, 29, 33, 34, 35, 36, 37, 38, 39, 44, 45, 46, 47, 48, 49, 55, 56, 57, 58, 59, 66, 67, 68, 69, 77, 78, 79, 88, 89, 99, 111, 112, 113, 114, 115, 116, 117, 118, 119, 121, 122, 123, 124

Offset

1,3

Comments

A054054(a(n)) = A000030(a(n));

the sequence differs from A009994, A032857 and A032898: a(65)=121 is not in A009994, a(58)=113 is not in A032857 and a(56)=111 is not in A032898.

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Mathematica

sddiQ[n_]:=Module[{idn=IntegerDigits[n]}, First[idn]==Min[idn]]; Select[ Range[ 0, 130], sddiQ] (* Harvey P. Dale, Oct 30 2011 *)

Prog

(Haskell)
a072544 n = a072544_list !! (n-1)
a072544_list = [x | x <- [0..], a054054 x == a000030 x]
-- Reinhard Zumkeller, Apr 25 2012

Crossrefs

Cf. A072543, A009994.

Sequence in context: A032898 A131058 A032857 * A009994 A239016 A102827

Adjacent sequences: A072541 A072542 A072543 * A072545 A072546 A072547

Keyword

nonn,base

Author

Reinhard Zumkeller, Aug 04 2002

Status

approved