Tetrahedral numbers that are not divisible by any smaller tetrahedral number except 1.

Terms

a(0) =1a(1) =4a(2) =10a(3) =35a(4) =165a(5) =286a(6) =969a(7) =1771a(8) =2925a(9) =3654a(10) =4495a(11) =9139a(12) =12341a(13) =16215a(14) =23426a(15) =32509a(16) =39711a(17) =47905a(18) =52394a(19) =67525a(20) =79079a(21) =91881a(22) =105995a(23) =129766a(24) =138415a(25) =156849a(26) =176851a(27) =209934a(28) =221815a(29) =246905