A054263 Number of palindromic triangular numbers with n digits.

3, 2, 3, 3, 2, 2, 6, 2, 1, 4, 7, 0, 4, 4, 12, 5, 6, 2, 3, 2, 6, 3, 6, 2, 2, 4, 3, 2, 5, 0, 3, 2, 1, 4, 3, 1, 10, 1, 4, 0

Offset: 1

Author

Patrick De Geest, Apr 15 2000

Keywords

• nonn
• base
• hard

Examples

			a(10) = 4: 1264114621, 1634004361, 5289009825, 6172882716.
		

Links

• P. De Geest, Palindromic Triangulars

Crossrefs

Cf. A000217, A003098, A008509, A008510.