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!)
A273617 Divide a(n) by the last digit of a(n-1); the remainder is the first digit of a(n+1). The sequence is started with a(1)=2 and always extended with the smallest integer not yet present in the sequence and not leading to a contradiction. 1

%I

%S 2,3,13,14,22,23,16,15,32,25,12,27,17,33,5,24,42,29,19,102,35,18,34,

%T 26,28,4,43,37,103,52,105,104,45,106,107,53,44,202,203,109,112,47,108,

%U 36,46,49,113,55,114,402,205,116,115,117,204,118,206,62,207,122,39,119,208,123,38,209,124,7,302,125,126,127,128,212,403,133,134,213,136,129,303,64,135,304,405,132,215,137,214,406,217,138,54,6,218,219,305,8

%N Divide a(n) by the last digit of a(n-1); the remainder is the first digit of a(n+1). The sequence is started with a(1)=2 and always extended with the smallest integer not yet present in the sequence and not leading to a contradiction.

%C No term can end with the digits 0 or 1 as those would produce a division by 0. This means that no term a(n) in the sequence is divisible by the last digit of a(n-1)

%H Eric Angelini, <a href="/A273617/b273617.txt">Table of n, a(n) for n = 1..10000</a>

%e 3 divided by 2 leaves 1 (this "1" starts the next integer)

%e 13 divided by 3 leaves 1 (this "1" starts the next integer)

%e 14 divided by 3 leaves 2 (this "2" starts the next integer)

%e 22 divided by 4 leaves 2 (this "2" starts the next integer)

%e 23 divided by 2 leaves 1 (this "1" starts the next integer)

%e 16 divided by 3 leaves 1 (this "1" starts the next integer)

%e 15 divided by 6 leaves 3 (this "3" starts the next integer)

%e 32 divided by 5 leaves 2 (this "2" starts the next integer)

%e 25 divided by 2 leaves 1 (this "1" starts the next integer)

%e 12 divided by 5 leaves 2 (this "2" starts the next integer)

%e 27 divided by 2 leaves 1 (this "1" starts the next integer)

%K nonn,base

%O 1,1

%A _Eric Angelini_ and _Jean-Marc Falcoz_, Jun 16 2016

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 June 13 00:57 EDT 2021. Contains 344980 sequences. (Running on oeis4.)