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!)
A273885 Pick any pair of "7" digits in the sequence. Those two "7"s are separated by k digits. This is the lexicographically earliest sequence of distinct terms in which all the resulting values of k are distinct. 1
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 38, 37, 39, 40, 41, 42, 43, 44, 45, 46, 48, 49, 50, 47, 51, 52, 53, 54, 55, 56, 58, 57, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 80 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

The sequence starts with a(1)=0. It is then always extended with the smallest integer not yet present and not leading to a contradiction (which would mean producing a value of k already seen).

LINKS

Eric Angelini, Table of n, a(n) for n = 1..1011

CROSSREFS

See A273376 for the equivalent sequence dealing with digit-"1" pairs instead of "7"

Sequence in context: A236674 A273886 A258068 * A174670 A212554 A178772

Adjacent sequences:  A273882 A273883 A273884 * A273886 A273887 A273888

KEYWORD

nonn,base

AUTHOR

Eric Angelini and Jean-Marc Falcoz, Jun 02 2016

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 May 12 21:06 EDT 2021. Contains 343829 sequences. (Running on oeis4.)