A068889 Triangular numbers with property that digits alternate in parity individually as well as in concatenation with previous terms.

1, 6, 10, 36, 78, 105, 210, 325, 496, 561, 630, 703, 2145, 2701, 6105, 6903, 8385, 23436, 30381, 41616, 50721, 67896, 70125, 81810, 90525, 210925, 214185, 230181, 232903, 254541, 258121, 290703, 414505, 454581, 490545, 498501, 634501, 674541, 810901, 852165

Offset

1,2

Links

Table of n, a(n) for n=1..40.

Crossrefs

Cf. A068882.

Sequence in context: A361325 A167330 A025629 * A203485 A221519 A332984

Adjacent sequences: A068886 A068887 A068888 * A068890 A068891 A068892

Keyword

base,nonn

Author

Amarnath Murthy, Mar 20 2002

Extensions

Corrected and extended by Sean A. Irvine, Mar 22 2024

Status

approved