|
| |
|
|
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; 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: A043510 A044387 A044768 * A039781 A135657 A178793
Adjacent sequences: A068638 A068639 A068640 * A068642 A068643 A068644
|
|
|
KEYWORD
| base,nonn
|
|
|
AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 28 2002
|
|
|
EXTENSIONS
| Edited by Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 24 2002.
|
| |
|
|
