Sequence of distinct least positive triangular numbers such that the arithmetic mean of the first n terms is also a triangular number. Initial term is 1.

A236416

Sequence of distinct least positive triangular numbers such that the arithmetic mean of the first n terms is also a triangular number. Initial term is 1.

Terms

    a(0) =1a(1) =55a(2) =28a(3) =136a(4) =6670a(5) =1378a(6) =18528a(7) =3828a(8) =3a(9) =3403a(10) =39340a(11) =75466a(12) =12403a(13) =179101a(14) =24310a(15) =6a(16) =22791a(17) =290703a(18) =37675a(19) =679195a(20) =10a(21) =66430a(22) =550107865a(23) =23981275a(24) =188170300a(25) =30548836a(26) =2303731a(27) =721801a(28) =28474831a(29) =311538241

External references