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

Author

Amarnath Murthy, Mar 20 2002

Keywords

• base
• nonn

Crossrefs

Cf. A068882.

Extensions

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