login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A125098 Values occurring in A123895. 2
0, 1, 10, 11, 12, 100, 101, 102, 110, 111, 112, 120, 121, 122, 123, 1000, 1001, 1002, 1010, 1011, 1012, 1020, 1021, 1022, 1023, 1100, 1101, 1102, 1110, 1111, 1112, 1120, 1121, 1122, 1123, 1200, 1201, 1202, 1203, 1210, 1211, 1212, 1213, 1220, 1221, 1222 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Also, numbers n such that A123895(n) = n. Each digit is either 0, has occurred before, or is one more than the largest preceding digit. The number of k-digit numbers in this sequence is A005493(k-1) for 2<=k<=9. The initial 0 prevents a match for k=1; later values fall short because there are no digits beyond 9 available in decimal.

LINKS

R. J. Mathar, Table of n, a(n) for n = 0..876

MAPLE

bag := {} ;

for i from 0 to 99999 do

    bag := bag union {A123895(i)} ;

end do:

sort(convert(bag, list)) ; # R. J. Mathar, Dec 10 2015

MATHEMATICA

f[n_] := Block[{d = Prepend[IntegerDigits@ n, 0], a, b, w}, b = DeleteDuplicates@ d; a = Range[0, Length@ b]; w = FromDigits@ Flatten[Part[a, FirstPosition[b, #]] & /@ d]; w]; Union@ Table[f@n, {n, 0, 10^4}] (* Michael De Vlieger, Dec 09 2015, Version 10 *)

CROSSREFS

Cf. A123895, A005493, A123902.

Sequence in context: A048024 A048002 A256523 * A239903 A244159 A171752

Adjacent sequences:  A125095 A125096 A125097 * A125099 A125100 A125101

KEYWORD

base,easy,nonn

AUTHOR

Franklin T. Adams-Watters, Nov 20 2006

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 9 16:50 EDT 2020. Contains 335545 sequences. (Running on oeis4.)