Tetrahedral numbers n*(n+1)*(n+2)/6 with n, n+1 and n+2 nonprime.

Terms

a(0) =120a(1) =560a(2) =1540a(3) =2600a(4) =2925a(5) =3276a(6) =5984a(7) =6545a(8) =7140a(9) =9880a(10) =15180a(11) =19600a(12) =20825a(13) =22100a(14) =27720a(15) =29260a(16) =30856a(17) =41664a(18) =43680a(19) =45760a(20) =54740a(21) =70300a(22) =73150a(23) =76076a(24) =88560a(25) =102340a(26) =105995a(27) =109736a(28) =125580a(29) =129766