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

1,3

Links

Table of n, a(n) for n=1..64.

Example

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.

Sequence in context: A325913 A283965 A193599 * A139437 A233746 A299233

Adjacent sequences: A068122 A068123 A068124 * A068126 A068127 A068128

Keyword

base,easy,nonn

Author

Amarnath Murthy, Feb 21 2002

Extensions

More terms from Sascha Kurz, Apr 03 2002

Offset and name edited by Michel Marcus, Dec 13 2017

Status

approved