The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A336954 Lexicographically earliest sequence of distinct positive terms such that, in the concatenation of the decimal representations of the terms, for any digit d at position p, d appears at some position q such that abs(p-q) = d. 1
 1, 10, 2, 3, 20, 30, 4, 5, 6, 7, 40, 50, 60, 70, 8, 9, 11, 12, 32, 83, 90, 22, 220, 21, 13, 33, 333, 23, 24, 25, 34, 43, 52, 42, 26, 27, 28, 36, 63, 71, 18, 61, 14, 29, 240, 31, 130, 91, 15, 35, 53, 54, 55, 44, 37, 430, 41, 17, 45, 38, 93, 51, 16, 48, 49, 46 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS This sequence combines features of A322467 and of A336880. Some numbers, like 121, cannot appear in this sequence. LINKS Rémy Sigrist, Table of n, a(n) for n = 1..10000 Rémy Sigrist, PARI program for A336954 EXAMPLE For n = 1: - we can choose a(1) = 1. For n = 2: - a(2) must start with a digit 1, - we can choose a(2) = 10. For n = 3: - we can choose a(3) = 2. For n = 4: - we can choose a(4) = 3. For n = 5: - a(5) must start with a digit 2, - we cab choose a(5) = 20. PROG (PARI) See Links section. CROSSREFS Cf. A322467, A336880. Sequence in context: A306321 A160136 A333478 * A322467 A342078 A049296 Adjacent sequences:  A336951 A336952 A336953 * A336955 A336956 A336957 KEYWORD nonn,base AUTHOR Rémy Sigrist, Aug 08 2020 STATUS approved

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

Last modified May 22 20:08 EDT 2022. Contains 353957 sequences. (Running on oeis4.)