Index of the smallest triangular number greater than 3^n.

Terms

a(0) =2a(1) =3a(2) =4a(3) =7a(4) =13a(5) =22a(6) =38a(7) =66a(8) =115a(9) =198a(10) =344a(11) =595a(12) =1031a(13) =1786a(14) =3093a(15) =5357a(16) =9279a(17) =16071a(18) =27836a(19) =48213a(20) =83508a(21) =144640a(22) =250524a(23) =433920a(24) =751571a(25) =1301759a(26) =2254713a(27) =3905278a(28) =6764140a(29) =11715834