A068125 Possible final digits of a triangular number.

0, 1, 3, 5, 6, 8, 10, 11, 15, 16, 20, 21, 25, 26, 28, 30, 31, 35, 36, 40, 41, 45, 46, 50, 51, 53, 55, 56, 60, 61, 65, 66, 70, 71, 75, 76, 78, 80, 81, 85, 86, 90, 91, 95, 96, 100, 101, 105, 106, 110, 111, 115, 116, 120, 121, 125, 126, 128, 130, 131, 135, 136, 140, 141

Offset: 1

Author

Amarnath Murthy, Feb 21 2002

Keywords

• base
• easy
• nonn

Examples

			11 is a term as 1711 is a triangular number.
13 is not a term as no triangular number is of the form 100k + 13.
		

Crossrefs

Cf. A000217, A008954.

Extensions

More terms from Sascha Kurz, Apr 03 2002

Offset and name edited by Michel Marcus, Dec 13 2017