This site is supported by donations to The OEIS Foundation.

The October issue of the Notices of the Amer. Math. Soc. has an article about the OEIS.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A068641 Smallest n-digit palindromic triangular number. If no such number exists then 0. 3
 1, 55, 171, 3003, 15051, 617716, 1269621, 35133153, 178727871, 1264114621, 13953435931, 0, 1313207023131, 19895044059891, 114401848104411, 1250444114440521, 11121736463712111, 357961407704169753 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS P. De Geest, Exhaustive list of Palindromic Triangulars EXAMPLE a(4) = 3003 = 77*78/2 and smallest 4 digit palindrome. a(12) = 0 as no 12 digit palindromic triangular exists. CROSSREFS Cf. A068642, A068643, A068644, A000217, A003098, A008509, A008510, A054263. Sequence in context: A044768 A276050 A256353 * A039781 A135657 A178793 Adjacent sequences:  A068638 A068639 A068640 * A068642 A068643 A068644 KEYWORD base,nonn AUTHOR Amarnath Murthy, Feb 28 2002 EXTENSIONS Edited by Patrick De Geest, Mar 24 2002. 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 23 02:13 EDT 2018. Contains 315271 sequences. (Running on oeis4.)