Triangular numbers n*(n+1)/2 with n composite, where number of prime factors of n, counted with multiplicity, is less than the number of prime factors in n+1.

A144524

Triangular numbers n*(n+1)/2 with n composite, where number of prime factors of n, counted with multiplicity, is less than the number of prime factors in n+1.

Terms

    a(0) =120a(1) =351a(2) =630a(3) =780a(4) =1225a(5) =1326a(6) =1540a(7) =1953a(8) =2016a(9) =2145a(10) =2415a(11) =2775a(12) =3003a(13) =3828a(14) =4186a(15) =4560a(16) =4950a(17) =6216a(18) =6670a(19) =7140a(20) =7626a(21) =7875a(22) =8385a(23) =9045a(24) =10296a(25) =10731a(26) =12090a(27) =12720a(28) =13041a(29) =14365

External references