a(n) is zero if n is a square, otherwise a(n) is the least triangular number m > 0 such that m*n is a triangular number.
A389657
a(n) is zero if n is a square, otherwise a(n) is the least triangular number m > 0 such that m*n is a triangular number.
Terms
- a(0) =0a(1) =3a(2) =1a(3) =0a(4) =3a(5) =1a(6) =3a(7) =15a(8) =0a(9) =1a(10) =6a(11) =3a(12) =6a(13) =15a(14) =1a(15) =0a(16) =78a(17) =21a(18) =10a(19) =6a(20) =1a(21) =3a(22) =45a(23) =190a(24) =0a(25) =3a(26) =55a(27) =1a(28) =15a(29) =10
External references
- oeis: A389657