Triangular numbers obtained as the concatenation of n and 2n.

A226772

Triangular numbers obtained as the concatenation of n and 2n.

Terms

    a(0) =36a(1) =1326a(2) =2346a(3) =3570a(4) =125250a(5) =223446a(6) =12502500a(7) =22234446a(8) =1250025000a(9) =2066441328a(10) =2222344446a(11) =2383847676a(12) =3673573470a(13) =125000250000a(14) =222223444446

External references