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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A236689 The sum of two neighboring digits is a palindrome; a(n) is the smallest possible nonnegative integer not occurring earlier. 0
 0, 1, 2, 3, 4, 5, 6, 10, 7, 11, 8, 12, 9, 20, 13, 14, 15, 16, 17, 18, 30, 21, 22, 23, 24, 25, 26, 27, 29, 200, 31, 32, 33, 34, 35, 36, 38, 100, 40, 41, 42, 43, 44, 45, 47, 101, 50, 51, 52, 53, 54, 56, 102, 60, 61, 62, 63, 65, 103, 80, 70, 71, 72, 74, 104 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS The sum of two digits is a palindrome iff it is less than 10 or equal to 11. Therefore, numbers with substrings 19, 28, 37, 39, 46, ... (this is not A065207) can never occur, and this is not a permutation of the nonnegative integers. LINKS E. Angelini, Palindromes -- with digits, SeqFan List, Jan 27 2014. PROG (PARI) a=u=0; (isp(s)=s<10||s==11); for(n=1, 100, print1(a", "); u+=1<1, d[j-1], a%10)+d[j])&&next; k=(k\10^(#d-j)+1)*10^(#d-j)-1; next(2)); a=k; break)) CROSSREFS Cf. A228730. Sequence in context: A194913 A194864 A131829 * A308719 A026266 A334389 Adjacent sequences:  A236686 A236687 A236688 * A236690 A236691 A236692 KEYWORD nonn,base AUTHOR Eric Angelini and M. F. Hasler, Jan 29 2014 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 August 3 06:43 EDT 2021. Contains 346435 sequences. (Running on oeis4.)