A077369 Smallest n-digit triangular numbers whose external digits as well as internal digits form triangular number.

0, 10, 105, 1035, 19900

Offset

0,2

Links

Table of n, a(n) for n=0..4.

Crossrefs

Cf. A077366, A077367, A077368.

Sequence in context: A210136 A068093 A260214 * A068618 A096484 A190955

Adjacent sequences: A077366 A077367 A077368 * A077370 A077371 A077372

Keyword

base,easy,nonn

Author

Amarnath Murthy, Nov 06 2002

Status

approved