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

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A303880 Lexicographically earliest sequence of distinct terms such that a(n) shares at least one even digit with a(n+1). 2
 2, 12, 20, 10, 30, 40, 4, 14, 24, 21, 22, 23, 25, 26, 6, 16, 36, 46, 34, 41, 42, 27, 28, 8, 18, 38, 48, 43, 44, 45, 47, 49, 54, 64, 56, 60, 50, 70, 80, 58, 68, 61, 62, 29, 32, 52, 72, 82, 78, 81, 83, 84, 74, 94, 104, 90, 100, 101, 102, 92, 112, 120, 103, 105, 106, 63, 65, 66, 67, 69, 76 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The sequence starts with a(1) = 2 and is always extended with the smallest integer not present that doesn't lead to a contradiction. The sequence is not a permutation of the integers > 0 as no term of A014261 (Numbers that contain odd digits only) will ever show. LINKS Jean-Marc Falcoz, Table of n, a(n) for n = 1..1001 EXAMPLE a(1) = 2 shares 2 with 12; a(2) = 12 shares 2 with 20; a(3) = 20 shares 0 with 10; a(4) = 10 shares 0 with 30; a(5) = 30 shares 0 with 40; a(6) = 40 shares 4 with 4; a(7) = 4 shares 4 with 14; a(8) = 14 shares 4 with 24; etc. CROSSREFS Cf. A303879 for the same idea with odd digits. Sequence in context: A259409 A073257 A240905 * A174977 A011532 A277964 Adjacent sequences:  A303877 A303878 A303879 * A303881 A303882 A303883 KEYWORD nonn,base AUTHOR Eric Angelini and Jean-Marc Falcoz, May 02 2018 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.

Last modified January 15 15:58 EST 2021. Contains 340187 sequences. (Running on oeis4.)