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!)
 A136687 Number of palindromes in the range [0,n] inclusive. 4
 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Partial sums of A136522. [Typo fixed by Colin Barker, Apr 26 2015] LINKS N. J. A. Sloane, Table of n, a(n) for n = 0..20202 FORMULA a(n) = inv_A002113(A261423(n)), where inv_A002113 is the inverse of A002113, i.e., it yields the index of a palindrome. - M. F. Hasler, Sep 10 2018 MATHEMATICA palQ[n_]:=Module[{idn=IntegerDigits[n]}, idn==Reverse[idn]]; Accumulate[ Table[ If[palQ[n], 1, 0], {n, 0, 80}]] (* Harvey P. Dale, May 11 2014 *) PROG (PARI) A136687(n)=inv_A002113(A261423(n)) \\ M. F. Hasler, Sep 09 2018 CROSSREFS Cf. A002113, A136522, A137180, A261423. Sequence in context: A331375 A179622 A285757 * A086706 A100470 A071604 Adjacent sequences:  A136684 A136685 A136686 * A136688 A136689 A136690 KEYWORD nonn,base AUTHOR N. J. A. Sloane, Apr 21 2008 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 April 4 05:34 EDT 2020. Contains 333212 sequences. (Running on oeis4.)