Triangular numbers that remain triangular when the least significant digit is moved to the beginning.

A068071

Triangular numbers that remain triangular when the least significant digit is moved to the beginning.

Terms

    a(0) =1a(1) =3a(2) =6a(3) =10a(4) =55a(5) =66a(6) =210a(7) =253a(8) =666a(9) =780a(10) =4851a(11) =8911a(12) =15400a(13) =17766a(14) =125751a(15) =303810a(16) =407253a(17) =906531a(18) =1125750a(19) =2648451a(20) =5925403a(21) =6706953a(22) =15772536a(23) =22207780a(24) =50085036a(25) =78406503a(26) =438094800a(27) =1623331710a(28) =1764803755a(29) =3437158416

External references