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

A068889

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

Terms

    a(0) =1a(1) =6a(2) =10a(3) =36a(4) =78a(5) =105a(6) =210a(7) =325a(8) =496a(9) =561a(10) =630a(11) =703a(12) =2145a(13) =2701a(14) =6105a(15) =6903a(16) =8385a(17) =23436a(18) =30381a(19) =41616a(20) =50721a(21) =67896a(22) =70125a(23) =81810a(24) =90525a(25) =210925a(26) =214185a(27) =230181a(28) =232903a(29) =254541

External references